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Theorem mapsnf1o2 6755
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 5578 . . 3 (𝑥𝑋) ∈ V
4 mapsncnv.f . . 3 𝐹 = (𝑥 ∈ (𝐵𝑚 𝑆) ↦ (𝑥𝑋))
53, 4fnmpti 5386 . 2 𝐹 Fn (𝐵𝑚 𝑆)
6 mapsncnv.s . . . . 5 𝑆 = {𝑋}
72snex 4218 . . . . 5 {𝑋} ∈ V
86, 7eqeltri 2269 . . . 4 𝑆 ∈ V
9 vex 2766 . . . . 5 𝑦 ∈ V
109snex 4218 . . . 4 {𝑦} ∈ V
118, 10xpex 4778 . . 3 (𝑆 × {𝑦}) ∈ V
12 mapsncnv.b . . . 4 𝐵 ∈ V
136, 12, 2, 4mapsncnv 6754 . . 3 𝐹 = (𝑦𝐵 ↦ (𝑆 × {𝑦}))
1411, 13fnmpti 5386 . 2 𝐹 Fn 𝐵
15 dff1o4 5512 . 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 3622  cmpt 4094   × cxp 4661  ccnv 4662   Fn wfn 5253  1-1-ontowf1o 5257  cfv 5258  (class class class)co 5922  𝑚 cmap 6707
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 4151  ax-pow 4207  ax-pr 4242  ax-un 4468  ax-setind 4573
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 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-res 4675  df-ima 4676  df-iota 5219  df-fun 5260  df-fn 5261  df-f 5262  df-f1 5263  df-fo 5264  df-f1o 5265  df-fv 5266  df-ov 5925  df-oprab 5926  df-mpo 5927  df-map 6709
This theorem is referenced by:  mapsnf1o3  6756
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