English
The underlying submodule of the unit fractional ideal equals the submodule corresponding to the top ideal.
Русский
Пусть подмодуль единичного дробного идеала равен подмодулю, соответствующему верхнему идеалу.
LaTeX
$$$\uparrow(1 : \mathrm{FractionalIdeal} S P) = \mathrm{coeSubmodule} P (\top : \mathrm{Ideal} R)$$$
Lean4
/-- `(1 : FractionalIdeal S P)` is defined as the R-submodule `f(R) ≤ P`.
However, this is not definitionally equal to `1 : Submodule R P`,
which is proved in the actual `simp` lemma `coe_one`. -/
theorem coe_one_eq_coeSubmodule_top : ↑(1 : FractionalIdeal S P) = coeSubmodule P (⊤ : Ideal R) :=
rfl