Theorem: ValidModel.r_of_a3 (ECTate/Algebra/EllipticCurve/Model.lean)

State before:
R : Type u
inst✝ : CommRing R
e : ValidModel R
r : R
⊢ (rst_iso r 0 0 e).toModel.a3 = e.a3 + r * e.a1
Tactic:
simp only [rst_iso, Model.rst_iso, one_pow, zero_mul, sub_zero, mul_zero, add_zero, one_mul]
State after:
no goals