Step
*
of Lemma
combination_functionality
∀[A,B:Type]. ∀n,m:ℤ. (A ~ B
⇒ Combination(n;A) ~ Combination(m;B) supposing n = m ∈ ℤ)
BY
{ xxx((Auto THEN D -2) THEN With ⌜λL.map(f;L)⌝ (D 0)⋅ THEN Auto THEN HypSubst' -1 0 THEN ThinVar `n')xxx }
1
1. [A] : Type
2. [B] : Type
3. m : ℤ
4. f : A ⟶ B
5. Bij(A;B;f)
⊢ Bij(Combination(m;A);Combination(m;B);λL.map(f;L))
Latex:
Latex:
\mforall{}[A,B:Type]. \mforall{}n,m:\mBbbZ{}. (A \msim{} B {}\mRightarrow{} Combination(n;A) \msim{} Combination(m;B) supposing n = m)
By
Latex:
xxx((Auto THEN D -2)
THEN With \mkleeneopen{}\mlambda{}L.map(f;L)\mkleeneclose{} (D 0)\mcdot{}
THEN Auto
THEN HypSubst' -1 0
THEN ThinVar `n')xxx
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