Goal:
  
  G : t
  HI : invariants G
  HG : acyclic_no_loop G
  b : bool
  H0 : is_true b
  H : is_true (~~ true)
  ============================
   False


DEBUG:Going to execute:
inversion H

Goals:

DEBUG:Going to execute:
do_ccl

Goals:

DEBUG:Going to execute:
try do_atom; repeat (do_intro; try do_atom); try arith_congr;
            (solve [ split; do_ccl ])

Goals:

DEBUG:Going to execute:
try do_atom; repeat (do_intro; try do_atom); try arith_congr;
            (solve [ split; do_ccl ])

Goals:

DEBUG:Going to execute:
try do_atom; repeat (do_intro; try do_atom); try arith_congr

Goals:

DEBUG:Going to execute:
try do_atom; repeat (do_intro; try do_atom)

Goals:

DEBUG:Going to execute:
try do_atom

Goals:

DEBUG:Going to execute:
repeat (do_intro; try do_atom)

Goals:

DEBUG:Going to execute:
try arith_congr

Goals:

DEBUG:Going to execute:
solve [ split; do_ccl ]