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Theorem f1ofveu 6642
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 6147 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵1-1-onto𝐴)
2 f1of 6135 . . . 4 (𝐹:𝐵1-1-onto𝐴𝐹:𝐵𝐴)
31, 2syl 17 . . 3 (𝐹:𝐴1-1-onto𝐵𝐹:𝐵𝐴)
4 feu 6078 . . 3 ((𝐹:𝐵𝐴𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
53, 4sylan 488 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹)
6 f1ocnvfvb 6532 . . . . . 6 ((𝐹:𝐴1-1-onto𝐵𝑥𝐴𝐶𝐵) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
763com23 1270 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ (𝐹𝐶) = 𝑥))
8 dff1o4 6143 . . . . . . 7 (𝐹:𝐴1-1-onto𝐵 ↔ (𝐹 Fn 𝐴𝐹 Fn 𝐵))
98simprbi 480 . . . . . 6 (𝐹:𝐴1-1-onto𝐵𝐹 Fn 𝐵)
10 fnopfvb 6235 . . . . . . 7 ((𝐹 Fn 𝐵𝐶𝐵) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
11103adant3 1080 . . . . . 6 ((𝐹 Fn 𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
129, 11syl3an1 1358 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝐶) = 𝑥 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
137, 12bitrd 268 . . . 4 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
14133expa 1264 . . 3 (((𝐹:𝐴1-1-onto𝐵𝐶𝐵) ∧ 𝑥𝐴) → ((𝐹𝑥) = 𝐶 ↔ ⟨𝐶, 𝑥⟩ ∈ 𝐹))
1514reubidva 3123 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → (∃!𝑥𝐴 (𝐹𝑥) = 𝐶 ↔ ∃!𝑥𝐴𝐶, 𝑥⟩ ∈ 𝐹))
165, 15mpbird 247 1 ((𝐹:𝐴1-1-onto𝐵𝐶𝐵) → ∃!𝑥𝐴 (𝐹𝑥) = 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384  w3a 1037   = wceq 1482  wcel 1989  ∃!wreu 2913  cop 4181  ccnv 5111   Fn wfn 5881  wf 5882  1-1-ontowf1o 5885  cfv 5886
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1721  ax-4 1736  ax-5 1838  ax-6 1887  ax-7 1934  ax-8 1991  ax-9 1998  ax-10 2018  ax-11 2033  ax-12 2046  ax-13 2245  ax-ext 2601  ax-sep 4779  ax-nul 4787  ax-pow 4841  ax-pr 4904
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1485  df-ex 1704  df-nf 1709  df-sb 1880  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2752  df-ne 2794  df-ral 2916  df-rex 2917  df-reu 2918  df-rab 2920  df-v 3200  df-sbc 3434  df-dif 3575  df-un 3577  df-in 3579  df-ss 3586  df-nul 3914  df-if 4085  df-sn 4176  df-pr 4178  df-op 4182  df-uni 4435  df-br 4652  df-opab 4711  df-id 5022  df-xp 5118  df-rel 5119  df-cnv 5120  df-co 5121  df-dm 5122  df-rn 5123  df-res 5124  df-ima 5125  df-iota 5849  df-fun 5888  df-fn 5889  df-f 5890  df-f1 5891  df-fo 5892  df-f1o 5893  df-fv 5894
This theorem is referenced by:  1arith2  15626  disjrdx  29388
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