Step
*
of Lemma
fset-image-compose
∀[T,A,B:Type]. ∀[eqt:EqDecider(T)]. ∀[eqa:EqDecider(A)]. ∀[eqb:EqDecider(B)]. ∀[f:T ⟶ A]. ∀[g:A ⟶ B]. ∀[s:fset(T)].
(g"(f"(s)) = g o f"(s) ∈ fset(B))
BY
{ (Auto
THEN (FsetExt THEN SupposeNot THEN Assert ⌜False⌝⋅ THEN Auto)
THEN (All (RWW "member-fset-image-iff") THENA Auto)
THEN SqExRepD
THEN D -1
THEN D 0
THEN All (RepUR ``compose``)
THEN Auto) }
Latex:
Latex:
\mforall{}[T,A,B:Type]. \mforall{}[eqt:EqDecider(T)]. \mforall{}[eqa:EqDecider(A)]. \mforall{}[eqb:EqDecider(B)]. \mforall{}[f:T {}\mrightarrow{} A].
\mforall{}[g:A {}\mrightarrow{} B]. \mforall{}[s:fset(T)].
(g"(f"(s)) = g o f"(s))
By
Latex:
(Auto
THEN (FsetExt THEN SupposeNot THEN Assert \mkleeneopen{}False\mkleeneclose{}\mcdot{} THEN Auto)
THEN (All (RWW "member-fset-image-iff") THENA Auto)
THEN SqExRepD
THEN D -1
THEN D 0
THEN All (RepUR ``compose``)
THEN Auto)
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