Theorem mapsnf1o 8939

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 8938	. . 3 ⊢ (𝐼 ∈ 𝑊 → 𝐹:𝐴–1-1-onto→X𝑦 ∈ {𝐼}𝐴)
3	2	adantl 486	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → 𝐹:𝐴–1-1-onto→X𝑦 ∈ {𝐼}𝐴)
4		snex 5413	. . . . 5 ⊢ {𝐼} ∈ V
5		ixpconstg 8906	. . . . . 6 ⊢ (({𝐼} ∈ V ∧ 𝐴 ∈ 𝑉) → X𝑦 ∈ {𝐼}𝐴 = (𝐴 ↑m {𝐼}))
6	5	eqcomd 2775	. . . . 5 ⊢ (({𝐼} ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
7	4, 6	mpan 702	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
8	7	adantr 485	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → (𝐴 ↑m {𝐼}) = X𝑦 ∈ {𝐼}𝐴)
9	8	f1oeq3d 6820	. 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 260	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊) → 𝐹:𝐴–1-1-onto→(𝐴 ↑m {𝐼}))

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1567   ∈ wcel 2149  Vcvv 3463  {csn 4594   ↦ cmpt 5196   × cxp 5662  –1-1-onto→wf1o 6538  (class class class)co 7413   ↑_m cmap 8826  Xcixp 8897

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-nul 5273  ax-pow 5339  ax-pr 5407  ax-un 7735

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5559  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-res 5676  df-ima 5677  df-iota 6495  df-fun 6541  df-fn 6542  df-f 6543  df-f1 6544  df-fo 6545  df-f1o 6546  df-fv 6547  df-ov 7416  df-oprab 7417  df-mpo 7418  df-map 8828  df-ixp 8898

This theorem is referenced by:  pwssnf1o  17554  mat1f1o  22606