English
For an R-algebra A, the support of A as an R-module equals the zero locus of the kernel of the algebra map R → A.
Русский
Для алгебры A над R опора A как R-модуля равна нулевому множеству ядра алгебраического отображения R → A.
LaTeX
$$$\mathrm{Supp}_R(A) = \mathrm{ZeroLocus}(\ker(\mathrm{algebraMap}\, R \, A))$$$
Lean4
theorem support_eq_empty_iff : Module.support R M = ∅ ↔ Subsingleton M :=
by
rw [← Set.subset_empty_iff, ← PrimeSpectrum.zeroLocus_singleton_one, ←
LocalizedModule.subsingleton_iff_support_subset, LocalizedModule.subsingleton_iff, subsingleton_iff_forall_eq 0]
simp only [Submonoid.powers_one, Submonoid.mem_bot, exists_eq_left, one_smul]