Theorem mapsnf1o2 6813

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 2782	. . . 4 ⊢ 𝑥 ∈ V
2		mapsncnv.x	. . . 4 ⊢ 𝑋 ∈ V
3	1, 2	fvex 5623	. . 3 ⊢ (𝑥‘𝑋) ∈ V
4		mapsncnv.f	. . 3 ⊢ 𝐹 = (𝑥 ∈ (𝐵 ↑𝑚 𝑆) ↦ (𝑥‘𝑋))
5	3, 4	fnmpti 5428	. 2 ⊢ 𝐹 Fn (𝐵 ↑𝑚 𝑆)
6		mapsncnv.s	. . . . 5 ⊢ 𝑆 = {𝑋}
7	2	snex 4248	. . . . 5 ⊢ {𝑋} ∈ V
8	6, 7	eqeltri 2282	. . . 4 ⊢ 𝑆 ∈ V
9		vex 2782	. . . . 5 ⊢ 𝑦 ∈ V
10	9	snex 4248	. . . 4 ⊢ {𝑦} ∈ V
11	8, 10	xpex 4811	. . 3 ⊢ (𝑆 × {𝑦}) ∈ V
12		mapsncnv.b	. . . 4 ⊢ 𝐵 ∈ V
13	6, 12, 2, 4	mapsncnv 6812	. . 3 ⊢ ◡𝐹 = (𝑦 ∈ 𝐵 ↦ (𝑆 × {𝑦}))
14	11, 13	fnmpti 5428	. 2 ⊢ ◡𝐹 Fn 𝐵
15		dff1o4 5556	. 2 ⊢ (𝐹:(𝐵 ↑𝑚 𝑆)–1-1-onto→𝐵 ↔ (𝐹 Fn (𝐵 ↑𝑚 𝑆) ∧ ◡𝐹 Fn 𝐵))
16	5, 14, 15	mpbir2an 947	1 ⊢ 𝐹:(𝐵 ↑𝑚 𝑆)–1-1-onto→𝐵

Syntax hints:   = wceq 1375   ∈ wcel 2180  Vcvv 2779  {csn 3646   ↦ cmpt 4124   × cxp 4694  ^◡ccnv 4695   Fn wfn 5289  –1-1-onto→wf1o 5293  ‘cfv 5294  (class class class)co 5974   ↑_𝑚 cmap 6765

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 617  ax-in2 618  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-13 2182  ax-14 2183  ax-ext 2191  ax-sep 4181  ax-pow 4237  ax-pr 4272  ax-un 4501  ax-setind 4606

This theorem depends on definitions:  df-bi 117  df-3an 985  df-tru 1378  df-fal 1381  df-nf 1487  df-sb 1789  df-eu 2060  df-mo 2061  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ne 2381  df-ral 2493  df-rex 2494  df-reu 2495  df-v 2781  df-sbc 3009  df-dif 3179  df-un 3181  df-in 3183  df-ss 3190  df-pw 3631  df-sn 3652  df-pr 3653  df-op 3655  df-uni 3868  df-br 4063  df-opab 4125  df-mpt 4126  df-id 4361  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-rn 4707  df-res 4708  df-ima 4709  df-iota 5254  df-fun 5296  df-fn 5297  df-f 5298  df-f1 5299  df-fo 5300  df-f1o 5301  df-fv 5302  df-ov 5977  df-oprab 5978  df-mpo 5979  df-map 6767

This theorem is referenced by:  mapsnf1o3  6814