Step
*
1
of Lemma
flip-permutes-permutations-list
1. n : ℕ
2. i : ℕn
3. j : ℕn
⊢ Bij({p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)} ;{p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)} ;λf.(f o (i, j)))
BY
{ (RepeatFor 2 (D 0) THEN Reduce 0 THEN Auto) }
1
1. n : ℕ
2. i : ℕn
3. j : ℕn
4. a1 : {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)}
5. a2 : {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)}
6. (a1 o (i, j)) = (a2 o (i, j)) ∈ {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)}
⊢ a1 = a2 ∈ {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)}
2
1. n : ℕ
2. i : ℕn
3. j : ℕn
4. b : {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)}
⊢ ∃a:{p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)} . ((a o (i, j)) = b ∈ {p:ℕn ⟶ ℕn| Inj(ℕn;ℕn;p)} )
Latex:
Latex:
1. n : \mBbbN{}
2. i : \mBbbN{}n
3. j : \mBbbN{}n
\mvdash{} Bij(\{p:\mBbbN{}n {}\mrightarrow{} \mBbbN{}n| Inj(\mBbbN{}n;\mBbbN{}n;p)\} ;\{p:\mBbbN{}n {}\mrightarrow{} \mBbbN{}n| Inj(\mBbbN{}n;\mBbbN{}n;p)\} ;\mlambda{}f.(f o (i, j)))
By
Latex:
(RepeatFor 2 (D 0) THEN Reduce 0 THEN Auto)
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