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Theorem mapsnf1o2 6764
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 2766 . . . 4 𝑥 ∈ V
2 mapsncnv.x . . . 4 𝑋 ∈ V
31, 2fvex 5581 . . 3 (𝑥𝑋) ∈ V
4 mapsncnv.f . . 3 𝐹 = (𝑥 ∈ (𝐵𝑚 𝑆) ↦ (𝑥𝑋))
53, 4fnmpti 5389 . 2 𝐹 Fn (𝐵𝑚 𝑆)
6 mapsncnv.s . . . . 5 𝑆 = {𝑋}
72snex 4219 . . . . 5 {𝑋} ∈ V
86, 7eqeltri 2269 . . . 4 𝑆 ∈ V
9 vex 2766 . . . . 5 𝑦 ∈ V
109snex 4219 . . . 4 {𝑦} ∈ V
118, 10xpex 4779 . . 3 (𝑆 × {𝑦}) ∈ V
12 mapsncnv.b . . . 4 𝐵 ∈ V
136, 12, 2, 4mapsncnv 6763 . . 3 𝐹 = (𝑦𝐵 ↦ (𝑆 × {𝑦}))
1411, 13fnmpti 5389 . 2 𝐹 Fn 𝐵
15 dff1o4 5515 . 2 (𝐹:(𝐵𝑚 𝑆)–1-1-onto𝐵 ↔ (𝐹 Fn (𝐵𝑚 𝑆) ∧ 𝐹 Fn 𝐵))
165, 14, 15mpbir2an 944 1 𝐹:(𝐵𝑚 𝑆)–1-1-onto𝐵
Colors of variables: wff set class
Syntax hints:   = wceq 1364  wcel 2167  Vcvv 2763  {csn 3623  cmpt 4095   × cxp 4662  ccnv 4663   Fn wfn 5254  1-1-ontowf1o 5258  cfv 5259  (class class class)co 5925  𝑚 cmap 6716
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243  ax-un 4469  ax-setind 4574
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-ral 2480  df-rex 2481  df-reu 2482  df-v 2765  df-sbc 2990  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-opab 4096  df-mpt 4097  df-id 4329  df-xp 4670  df-rel 4671  df-cnv 4672  df-co 4673  df-dm 4674  df-rn 4675  df-res 4676  df-ima 4677  df-iota 5220  df-fun 5261  df-fn 5262  df-f 5263  df-f1 5264  df-fo 5265  df-f1o 5266  df-fv 5267  df-ov 5928  df-oprab 5929  df-mpo 5930  df-map 6718
This theorem is referenced by:  mapsnf1o3  6765
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