Step
*
of Lemma
compose-surjections
∀[A,B,C:Type]. ∀[f:A ⟶ B]. ∀[g:B ⟶ C]. (Surj(A;B;f)
⇒ Surj(B;C;g)
⇒ Surj(A;C;g o f))
BY
{ (Auto THEN (D 0 THEN Auto) THEN (D -2 With ⌜b⌝ THENA Auto) THEN D -1 THEN D -4 With ⌜a⌝ THEN ExRepD THEN Auto) }
Latex:
Latex:
\mforall{}[A,B,C:Type]. \mforall{}[f:A {}\mrightarrow{} B]. \mforall{}[g:B {}\mrightarrow{} C]. (Surj(A;B;f) {}\mRightarrow{} Surj(B;C;g) {}\mRightarrow{} Surj(A;C;g o f))
By
Latex:
(Auto
THEN (D 0 THEN Auto)
THEN (D -2 With \mkleeneopen{}b\mkleeneclose{} THENA Auto)
THEN D -1
THEN D -4 With \mkleeneopen{}a\mkleeneclose{}
THEN ExRepD
THEN Auto)
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