Theorem mapsnf1o 8881

Description: A bijection between a set and single-point functions to it. (Contributed by Stefan O'Rear, 24-Jan-2015.)

Hypothesis

Ref	Expression
ixpsnf1o.f	⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ ({𝐼} × {𝑥}))

Assertion

Ref	Expression
mapsnf1o	⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → 𝐹:𝐴–1-1-onto→(𝐴 ↑m {𝐼}))

Distinct variable groups:   𝑥,𝐼   𝑥,𝐴   𝑥,𝑉   𝑥,𝑊

Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem mapsnf1o

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ixpsnf1o.f	. . . 4 ⊢ 𝐹 = (𝑥 ∈ 𝐴 ↦ ({𝐼} × {𝑥}))
2	1	ixpsnf1o 8880	. . 3 ⊢ (𝐼 ∈ 𝑊 → 𝐹:𝐴–1-1-onto→X𝑦 ∈ {𝐼}𝐴)
3	2	adantl 481	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → 𝐹:𝐴–1-1-onto→X𝑦 ∈ {𝐼}𝐴)
4		snex 5382	. . . . 5 ⊢ {𝐼} ∈ V
5		ixpconstg 8848	. . . . . 6 ⊢ (({𝐼} ∈ V ∧ 𝐴 ∈ 𝑉) → X𝑦 ∈ {𝐼}𝐴 = (𝐴 ↑m {𝐼}))
6	5	eqcomd 2743	. . . . 5 ⊢ (({𝐼} ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
7	4, 6	mpan 691	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
8	7	adantr 480	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
9	8	f1oeq3d 6772	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → (𝐹:𝐴–1-1-onto→(𝐴 ↑m {𝐼}) ↔ 𝐹:𝐴–1-1-onto→X𝑦 ∈ {𝐼}𝐴))
10	3, 9	mpbird 257	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → 𝐹:𝐴–1-1-onto→(𝐴 ↑m {𝐼}))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1542   ∈ wcel 2114  Vcvv 3441  {csn 4581   ↦ cmpt 5180   × cxp 5623  –1-1-onto→wf1o 6492  (class class class)co 7360   ↑_m cmap 8767  Xcixp 8839

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5242  ax-nul 5252  ax-pow 5311  ax-pr 5378  ax-un 7682

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3062  df-reu 3352  df-rab 3401  df-v 3443  df-sbc 3742  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4287  df-if 4481  df-pw 4557  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-iota 6449  df-fun 6495  df-fn 6496  df-f 6497  df-f1 6498  df-fo 6499  df-f1o 6500  df-fv 6501  df-ov 7363  df-oprab 7364  df-mpo 7365  df-map 8769  df-ixp 8840

This theorem is referenced by:  pwssnf1o  17423  mat1f1o  22426