English
In the boundary-noted case, the differential equals the conjugated differential composed with toCycles maps and their inverses.
Русский
В случае на границе д разности дифференциал равен сопряженной разности через карты toCycles и их обратные.
LaTeX
$$$(K.truncLE' e).d i j = (K.truncLE'XIso e hi' (e.not_boundaryLE_prev hij)).hom \circ K.toCycles i' j' \circ (K.truncLE'XIso e hj' hj).inv$$$
Lean4
theorem truncLE'_d_eq_toCycles {i j : ι} (hij : c.Rel i j) {i' j' : ι'} (hi' : e.f i = i') (hj' : e.f j = j')
(hj : e.BoundaryLE j) :
(K.truncLE' e).d i j =
(K.truncLE'XIso e hi' (e.not_boundaryLE_prev hij)).hom ≫ K.toCycles i' j' ≫ (K.truncLE'XIsoCycles e hj' hj).inv :=
Quiver.Hom.op_inj
(by
simpa [truncLE', truncLE'XIso, truncLE'XIsoCycles] using
K.op.truncGE'_d_eq_fromOpcycles e.op hij hj' hi' (by simpa))