English
The kerTotal is the kernel of the corresponding linear map defined by the derivation. Equivalently, kerTotal equals the ker of a certain map built from D.
Русский
kerTotal совпадает с ядром соответствующего линейного отображения, задаваемого дифференциалом D.
LaTeX
$$$\\ker(\\mathrm{Finsupp.linearCombination}(S, \\mathrm{D}(R,S))) = \\kerTotal(R,S)$$$
Lean4
theorem map_compDer :
(KaehlerDifferential.map R S A B).compDer (KaehlerDifferential.D R A) =
((KaehlerDifferential.D S B).restrictScalars R).compAlgebraMap A :=
Derivation.liftKaehlerDifferential_comp _