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Theorem f1ofveu 7425
Description: There is one domain element for each value of a one-to-one onto function. (Contributed by NM, 26-May-2006.)
Assertion
Ref Expression
f1ofveu ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴 (𝐹𝑥) = 𝐶)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐶   𝑥,𝐹

Proof of Theorem f1ofveu
StepHypRef Expression
1 f1ocnv 6861 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵1-1-onto𝐴)
2 f1of 6849 . . . 4 (𝐹:𝐵1-1-onto𝐴𝐹:𝐵𝐴)
31, 2syl 17 . . 3 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵𝐴)
4 feu 6785 . . 3 ((𝐹:𝐵𝐴𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
53, 4sylan 580 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
6 f1ocnvfvb 7299 . . . . . 6 ((𝐹:𝐴1-1-onto𝐵𝑥𝐴𝐶𝐵) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
763com23 1125 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
8 dff1o4 6857 . . . . . . 7 (𝐹:𝐴1-1-onto𝐵 ↔ (𝐹 Fn 𝐴𝐹 Fn 𝐵))
98simprbi 496 . . . . . 6 (𝐹:𝐴1-1-onto𝐵𝐹 Fn 𝐵)
10 fnopfvb 6961 . . . . . . 7 ((𝐹 Fn 𝐵𝐶𝐵) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
11103adant3 1131 . . . . . 6 ((𝐹 Fn 𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
129, 11syl3an1 1162 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
137, 12bitrd 279 . . . 4 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
14133expa 1117 . . 3 (((𝐹:𝐴1-1-onto𝐵𝐶𝐵) ∧ 𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
1514reubidva 3394 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → (∃!𝑥𝐴 (𝐹𝑥) = 𝐶 ↔ ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹))
165, 15mpbird 257 1 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴 (𝐹𝑥) = 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395  w3a 1086   = wceq 1537  wcel 2106  ∃!wreu 3376  cop 4637  ccnv 5688   Fn wfn 6558  wf 6559  1-1-ontowf1o 6562  cfv 6563
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-ne 2939  df-ral 3060  df-rex 3069  df-reu 3379  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-br 5149  df-opab 5211  df-id 5583  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571
This theorem is referenced by:  1arith2  16962  uspgredgiedg  29207  disjrdx  32611  ply1divalg3  35627  reuf1odnf  47057  reuf1od  47058
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