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Theorem f1ofveu 7270
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 6728 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵1-1-onto𝐴)
2 f1of 6716 . . . 4 (𝐹:𝐵1-1-onto𝐴𝐹:𝐵𝐴)
31, 2syl 17 . . 3 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵𝐴)
4 feu 6650 . . 3 ((𝐹:𝐵𝐴𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
53, 4sylan 580 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
6 f1ocnvfvb 7151 . . . . . 6 ((𝐹:𝐴1-1-onto𝐵𝑥𝐴𝐶𝐵) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
763com23 1125 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
8 dff1o4 6724 . . . . . . 7 (𝐹:𝐴1-1-onto𝐵 ↔ (𝐹 Fn 𝐴𝐹 Fn 𝐵))
98simprbi 497 . . . . . 6 (𝐹:𝐴1-1-onto𝐵𝐹 Fn 𝐵)
10 fnopfvb 6823 . . . . . . 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 278 . . . 4 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
14133expa 1117 . . 3 (((𝐹:𝐴1-1-onto𝐵𝐶𝐵) ∧ 𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
1514reubidva 3322 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → (∃!𝑥𝐴 (𝐹𝑥) = 𝐶 ↔ ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹))
165, 15mpbird 256 1 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴 (𝐹𝑥) = 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  w3a 1086   = wceq 1539  wcel 2106  ∃!wreu 3066  cop 4567  ccnv 5588   Fn wfn 6428  wf 6429  1-1-ontowf1o 6432  cfv 6433
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pr 5352
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-br 5075  df-opab 5137  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441
This theorem is referenced by:  1arith2  16629  disjrdx  30930  reuf1odnf  44599  reuf1od  44600
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