Notation "0" := rO.Notation "1" := rI.Infix "+" := radd.Infix "-" := rsub.Notation "- x" := (ropp x).(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Semi Ring *)
 Record semi_ring_theory : Prop := mk_srt {
    SRadd_0_l   : forall n, 0 + n == n;
    SRadd_comm  : forall n m, n + m == m + n ;
    SRadd_assoc : forall n m p, n + (m + p) == (n + m) + p;
    SRmul_1_l   : forall n, 1*n == n;
    SRmul_0_l   : forall n, 0*n == 0;
    SRmul_comm  : forall n m, n*m == m*n;
    SRmul_assoc : forall n m p, n*(m*p) == (n*m)*p;
    SRdistr_l   : forall n m p, (n + m)*p == n*p + m*p
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Almost Ring *)
(*Almost ring are no ring : Ropp_def is missing **)
 Record almost_ring_theory : Prop := mk_art {
    ARadd_0_l   : forall x, 0 + x == x;
    ARadd_comm  : forall x y, x + y == y + x;
    ARadd_assoc : forall x y z, x + (y + z) == (x + y) + z;
    ARmul_1_l   : forall x, 1 * x == x;
    ARmul_0_l   : forall x, 0 * x == 0;
    ARmul_comm  : forall x y, x * y == y * x;
    ARmul_assoc : forall x y z, x * (y * z) == (x * y) * z;
    ARdistr_l   : forall x y z, (x + y) * z == (x * z) + (y * z);
    ARopp_mul_l : forall x y, -(x * y) == -x * y;
    ARopp_add   : forall x y, -(x + y) == -x + -y;
    ARsub_def   : forall x y, x - y == x + -y
  }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Ring *)
 Record ring_theory : Prop := mk_rt {
    Radd_0_l    : forall x, 0 + x == x;
    Radd_comm   : forall x y, x + y == y + x;
    Radd_assoc  : forall x y z, x + (y + z) == (x + y) + z;
    Rmul_1_l    : forall x, 1 * x == x;
    Rmul_comm   : forall x y, x * y == y * x;
    Rmul_assoc  : forall x y z, x * (y * z) == (x * y) * z;
    Rdistr_l    : forall x y z, (x + y) * z == (x * z) + (y * z);
    Rsub_def    : forall x y, x - y == x + -y;
    Ropp_def    : forall x, x + (- x) == 0
 }.(** Equality is extensional *)

 Record sring_eq_ext : Prop := mk_seqe {
    (* SRing operators are compatible with equality *)
    SRadd_ext : Proper (req ==> req ==> req) radd;
    SRmul_ext : Proper (req ==> req ==> req) rmul
  }.(** Equality is extensional *)

 Record sring_eq_ext : Prop := mk_seqe {
    (* SRing operators are compatible with equality *)
    SRadd_ext : Proper (req ==> req ==> req) radd;
    SRmul_ext : Proper (req ==> req ==> req) rmul
  }.(** Equality is extensional *)

 Record sring_eq_ext : Prop := mk_seqe {
    (* SRing operators are compatible with equality *)
    SRadd_ext : Proper (req ==> req ==> req) radd;
    SRmul_ext : Proper (req ==> req ==> req) rmul
  }.(** Equality is extensional *)

 Record sring_eq_ext : Prop := mk_seqe {
    (* SRing operators are compatible with equality *)
    SRadd_ext : Proper (req ==> req ==> req) radd;
    SRmul_ext : Proper (req ==> req ==> req) rmul
  }.Record ring_eq_ext : Prop := mk_reqe {
    (* Ring operators are compatible with equality *)
    Radd_ext : Proper (req ==> req ==> req) radd;
    Rmul_ext : Proper (req ==> req ==> req) rmul;
    Ropp_ext : Proper (req ==> req) ropp
  }.Record ring_eq_ext : Prop := mk_reqe {
    (* Ring operators are compatible with equality *)
    Radd_ext : Proper (req ==> req ==> req) radd;
    Rmul_ext : Proper (req ==> req ==> req) rmul;
    Ropp_ext : Proper (req ==> req) ropp
  }.Record ring_eq_ext : Prop := mk_reqe {
    (* Ring operators are compatible with equality *)
    Radd_ext : Proper (req ==> req ==> req) radd;
    Rmul_ext : Proper (req ==> req ==> req) rmul;
    Ropp_ext : Proper (req ==> req) ropp
  }.Record ring_eq_ext : Prop := mk_reqe {
    (* Ring operators are compatible with equality *)
    Radd_ext : Proper (req ==> req ==> req) radd;
    Rmul_ext : Proper (req ==> req ==> req) rmul;
    Ropp_ext : Proper (req ==> req) ropp
  }.Record ring_eq_ext : Prop := mk_reqe {
    (* Ring operators are compatible with equality *)
    Radd_ext : Proper (req ==> req ==> req) radd;
    Rmul_ext : Proper (req ==> req ==> req) rmul;
    Ropp_ext : Proper (req ==> req) ropp
  }.Infix "+!" := cadd.Infix "-!" := csub.Infix "*!" := cmul.Notation "-! x" := (copp x).Notation "?=!" := ceqb.Notation "[ x ]" := (phi x).(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(*for semi rings*)
 Record semi_morph : Prop := mkRmorph {
    Smorph0 : [cO] == 0;
    Smorph1 : [cI] == 1;
    Smorph_add : forall x y, [x +! y] == [x]+[y];
    Smorph_mul : forall x y, [x *! y] == [x]*[y];
    Smorph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.(* for rings*)
 Record ring_morph : Prop := mkmorph {
    morph0    : [cO] == 0;
    morph1    : [cI] == 1;
    morph_add : forall x y, [x +! y] == [x]+[y];
    morph_sub : forall x y, [x -! y] == [x]-[y];
    morph_mul : forall x y, [x *! y] == [x]*[y];
    morph_opp : forall x, [-!x] == -[x];
    morph_eq  : forall x y, x?=!y = true -> [x] == [y]
  }.Record sign_theory : Prop := mksign_th {
    sign_spec : forall c c', get_sign c = Some c' -> c ?=! -! c' = true
  }.Record sign_theory : Prop := mksign_th {
    sign_spec : forall c c', get_sign c = Some c' -> c ?=! -! c' = true
  }.Record sign_theory : Prop := mksign_th {
    sign_spec : forall c c', get_sign c = Some c' -> c ?=! -! c' = true
  }.Definition get_sign_None (c:C) := @None C.

Lemma get_sign_None_th : sign_theory get_sign_None.