Theorem mapsnf1o2 6870

Description: Explicit bijection between a set and its singleton functions. (Contributed by Stefan O'Rear, 21-Mar-2015.)

Hypotheses

Ref	Expression
mapsncnv.s	⊢ 𝑆 = {𝑋}
mapsncnv.b	⊢ 𝐵 ∈ V
mapsncnv.x	⊢ 𝑋 ∈ V
mapsncnv.f	⊢ 𝐹 = (𝑥 ∈ (𝐵 ↑𝑚 𝑆) ↦ (𝑥‘𝑋))

Assertion

Ref	Expression
mapsnf1o2	⊢ 𝐹:(𝐵 ↑𝑚 𝑆)–1-1-onto→𝐵

Distinct variable groups:   𝑥,𝐵   𝑥,𝑆

Allowed substitution hints:   𝐹(𝑥)   𝑋(𝑥)

Proof of Theorem mapsnf1o2

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 2804	. . . 4 ⊢ 𝑥 ∈ V
2		mapsncnv.x	. . . 4 ⊢ 𝑋 ∈ V
3	1, 2	fvex 5662	. . 3 ⊢ (𝑥‘𝑋) ∈ V
4		mapsncnv.f	. . 3 ⊢ 𝐹 = (𝑥 ∈ (𝐵 ↑𝑚 𝑆) ↦ (𝑥‘𝑋))
5	3, 4	fnmpti 5463	. 2 ⊢ 𝐹 Fn (𝐵 ↑𝑚 𝑆)
6		mapsncnv.s	. . . . 5 ⊢ 𝑆 = {𝑋}
7	2	snex 4277	. . . . 5 ⊢ {𝑋} ∈ V
8	6, 7	eqeltri 2303	. . . 4 ⊢ 𝑆 ∈ V
9		vex 2804	. . . . 5 ⊢ 𝑦 ∈ V
10	9	snex 4277	. . . 4 ⊢ {𝑦} ∈ V
11	8, 10	xpex 4844	. . 3 ⊢ (𝑆 × {𝑦}) ∈ V
12		mapsncnv.b	. . . 4 ⊢ 𝐵 ∈ V
13	6, 12, 2, 4	mapsncnv 6869	. . 3 ⊢ ◡𝐹 = (𝑦 ∈ 𝐵 ↦ (𝑆 × {𝑦}))
14	11, 13	fnmpti 5463	. 2 ⊢ ◡𝐹 Fn 𝐵
15		dff1o4 5594	. 2 ⊢ (𝐹:(𝐵 ↑𝑚 𝑆)–1-1-onto→𝐵 ↔ (𝐹 Fn (𝐵 ↑𝑚 𝑆) ∧ ◡𝐹 Fn 𝐵))
16	5, 14, 15	mpbir2an 950	1 ⊢ 𝐹:(𝐵 ↑𝑚 𝑆)–1-1-onto→𝐵

Syntax hints:   = wceq 1397   ∈ wcel 2201  Vcvv 2801  {csn 3670   ↦ cmpt 4151   × cxp 4725  ^◡ccnv 4726   Fn wfn 5323  –1-1-onto→wf1o 5327  ‘cfv 5328  (class class class)co 6023   ↑_𝑚 cmap 6822

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-ral 2514  df-rex 2515  df-reu 2516  df-v 2803  df-sbc 3031  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-br 4090  df-opab 4152  df-mpt 4153  df-id 4392  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-ov 6026  df-oprab 6027  df-mpo 6028  df-map 6824

This theorem is referenced by:  mapsnf1o3  6871