Step
*
of Lemma
product-map
∀[A,B,C:Type].
∀as:A List. ∀bs:B List. ∀F:A ⟶ B ⟶ C. ∃cs:C List. ∀c:C. ((c ∈ cs)
⇐⇒ (∃a∈as. (∃b∈bs. c = (F a b) ∈ C)))
BY
{ xxx((UnivCD THENA Auto)
THEN (With ⌜product-map(F;as;bs)⌝ (D 0)⋅ THENA Auto)
THEN (D 0 THENA Auto)
THEN RWW "member-product-map l_exists_iff" 0
THEN Auto)xxx }
Latex:
Latex:
\mforall{}[A,B,C:Type].
\mforall{}as:A List. \mforall{}bs:B List. \mforall{}F:A {}\mrightarrow{} B {}\mrightarrow{} C.
\mexists{}cs:C List. \mforall{}c:C. ((c \mmember{} cs) \mLeftarrow{}{}\mRightarrow{} (\mexists{}a\mmember{}as. (\mexists{}b\mmember{}bs. c = (F a b))))
By
Latex:
xxx((UnivCD THENA Auto)
THEN (With \mkleeneopen{}product-map(F;as;bs)\mkleeneclose{} (D 0)\mcdot{} THENA Auto)
THEN (D 0 THENA Auto)
THEN RWW "member-product-map l\_exists\_iff" 0
THEN Auto)xxx
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