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Theorem f11o 7880
Description: Relationship between one-to-one and one-to-one onto function. (Contributed by NM, 4-Apr-1998.)
Hypothesis
Ref Expression
f11o.1 𝐹 ∈ V
Assertion
Ref Expression
f11o (𝐹:𝐴1-1𝐵 ↔ ∃𝑥(𝐹:𝐴1-1-onto𝑥𝑥𝐵))
Distinct variable groups:   𝑥,𝐹   𝑥,𝐴   𝑥,𝐵

Proof of Theorem f11o
StepHypRef Expression
1 f11o.1 . . . 4 𝐹 ∈ V
21ffoss 7879 . . 3 (𝐹:𝐴𝐵 ↔ ∃𝑥(𝐹:𝐴onto𝑥𝑥𝐵))
32anbi1i 625 . 2 ((𝐹:𝐴𝐵 ∧ Fun 𝐹) ↔ (∃𝑥(𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
4 df-f1 6502 . 2 (𝐹:𝐴1-1𝐵 ↔ (𝐹:𝐴𝐵 ∧ Fun 𝐹))
5 dff1o3 6791 . . . . . 6 (𝐹:𝐴1-1-onto𝑥 ↔ (𝐹:𝐴onto𝑥 ∧ Fun 𝐹))
65anbi1i 625 . . . . 5 ((𝐹:𝐴1-1-onto𝑥𝑥𝐵) ↔ ((𝐹:𝐴onto𝑥 ∧ Fun 𝐹) ∧ 𝑥𝐵))
7 an32 645 . . . . 5 (((𝐹:𝐴onto𝑥 ∧ Fun 𝐹) ∧ 𝑥𝐵) ↔ ((𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
86, 7bitri 275 . . . 4 ((𝐹:𝐴1-1-onto𝑥𝑥𝐵) ↔ ((𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
98exbii 1851 . . 3 (∃𝑥(𝐹:𝐴1-1-onto𝑥𝑥𝐵) ↔ ∃𝑥((𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
10 19.41v 1954 . . 3 (∃𝑥((𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹) ↔ (∃𝑥(𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
119, 10bitri 275 . 2 (∃𝑥(𝐹:𝐴1-1-onto𝑥𝑥𝐵) ↔ (∃𝑥(𝐹:𝐴onto𝑥𝑥𝐵) ∧ Fun 𝐹))
123, 4, 113bitr4i 303 1 (𝐹:𝐴1-1𝐵 ↔ ∃𝑥(𝐹:𝐴1-1-onto𝑥𝑥𝐵))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 397  wex 1782  wcel 2107  Vcvv 3444  wss 3911  ccnv 5633  Fun wfun 6491  wf 6493  1-1wf1 6494  ontowfo 6495  1-1-ontowf1o 6496
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 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-ext 2704  ax-sep 5257  ax-nul 5264  ax-pr 5385  ax-un 7673
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-sb 2069  df-clab 2711  df-cleq 2725  df-clel 2811  df-rab 3407  df-v 3446  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-br 5107  df-opab 5169  df-cnv 5642  df-dm 5644  df-rn 5645  df-f 6501  df-f1 6502  df-fo 6503  df-f1o 6504
This theorem is referenced by:  domen  8904  uspgrsprfo  46136
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