[Merged by Bors] - feat: Lemmas about ZMod
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Added some lemmas about `ZMod` and its units: * Generalized `lt` to `le` in two lemmas * `((a : ZMod n) : ZMod m) = a` if `m ≤ n` * `unitsMap` is surjective * `Units.map f (-a) = -Units.map f a` (which can be applied to `unitsMap`) * `Units.map (-1) = -1` (which can be applied to `unitsMap`)
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Added some lemmas about
ZModand its units:lttolein two lemmas((a : ZMod n) : ZMod m) = aifm ≤ nunitsMapis surjectiveUnits.map f (-a) = -Units.map f a(which can be applied tounitsMap)Units.map (-1) = -1(which can be applied tounitsMap)