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Theorem mapsnf1o2 6699
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 ∈ (𝐵𝑚 𝑆) ↦ (𝑥𝑋))
Assertion
Ref Expression
mapsnf1o2 𝐹:(𝐵𝑚 𝑆)–1-1-onto𝐵
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.
StepHypRef Expression
1 vex 2742 . . . 4 𝑥 ∈ V
2 mapsncnv.x . . . 4 𝑋 ∈ V
31, 2fvex 5537 . . 3 (𝑥𝑋) ∈ V
4 mapsncnv.f . . 3 𝐹 = (𝑥 ∈ (𝐵𝑚 𝑆) ↦ (𝑥𝑋))
53, 4fnmpti 5346 . 2 𝐹 Fn (𝐵𝑚 𝑆)
6 mapsncnv.s . . . . 5 𝑆 = {𝑋}
72snex 4187 . . . . 5 {𝑋} ∈ V
86, 7eqeltri 2250 . . . 4 𝑆 ∈ V
9 vex 2742 . . . . 5 𝑦 ∈ V
109snex 4187 . . . 4 {𝑦} ∈ V
118, 10xpex 4743 . . 3 (𝑆 × {𝑦}) ∈ V
12 mapsncnv.b . . . 4 𝐵 ∈ V
136, 12, 2, 4mapsncnv 6698 . . 3 𝐹 = (𝑦𝐵 ↦ (𝑆 × {𝑦}))
1411, 13fnmpti 5346 . 2 𝐹 Fn 𝐵
15 dff1o4 5471 . 2 (𝐹:(𝐵𝑚 𝑆)–1-1-onto𝐵 ↔ (𝐹 Fn (𝐵𝑚 𝑆) ∧ 𝐹 Fn 𝐵))
165, 14, 15mpbir2an 942 1 𝐹:(𝐵𝑚 𝑆)–1-1-onto𝐵
Colors of variables: wff set class
Syntax hints:   = wceq 1353  wcel 2148  Vcvv 2739  {csn 3594  cmpt 4066   × cxp 4626  ccnv 4627   Fn wfn 5213  1-1-ontowf1o 5217  cfv 5218  (class class class)co 5878  𝑚 cmap 6651
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-setind 4538
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-ral 2460  df-rex 2461  df-reu 2462  df-v 2741  df-sbc 2965  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-mpt 4068  df-id 4295  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-rn 4639  df-res 4640  df-ima 4641  df-iota 5180  df-fun 5220  df-fn 5221  df-f 5222  df-f1 5223  df-fo 5224  df-f1o 5225  df-fv 5226  df-ov 5881  df-oprab 5882  df-mpo 5883  df-map 6653
This theorem is referenced by:  mapsnf1o3  6700
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