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Theorem f1ocnvfvb 7027
Description: Relationship between the value of a one-to-one onto function and the value of its converse. (Contributed by NM, 20-May-2004.)
Assertion
Ref Expression
f1ocnvfvb ((𝐹:𝐴1-1-onto𝐵𝐶𝐴𝐷𝐵) → ((𝐹𝐶) = 𝐷 ↔ (𝐹𝐷) = 𝐶))

Proof of Theorem f1ocnvfvb
StepHypRef Expression
1 f1ocnvfv 7026 . . 3 ((𝐹:𝐴1-1-onto𝐵𝐶𝐴) → ((𝐹𝐶) = 𝐷 → (𝐹𝐷) = 𝐶))
213adant3 1124 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐴𝐷𝐵) → ((𝐹𝐶) = 𝐷 → (𝐹𝐷) = 𝐶))
3 fveq2 6663 . . . . 5 (𝐶 = (𝐹𝐷) → (𝐹𝐶) = (𝐹‘(𝐹𝐷)))
43eqcoms 2826 . . . 4 ((𝐹𝐷) = 𝐶 → (𝐹𝐶) = (𝐹‘(𝐹𝐷)))
5 f1ocnvfv2 7025 . . . . 5 ((𝐹:𝐴1-1-onto𝐵𝐷𝐵) → (𝐹‘(𝐹𝐷)) = 𝐷)
65eqeq2d 2829 . . . 4 ((𝐹:𝐴1-1-onto𝐵𝐷𝐵) → ((𝐹𝐶) = (𝐹‘(𝐹𝐷)) ↔ (𝐹𝐶) = 𝐷))
74, 6syl5ib 245 . . 3 ((𝐹:𝐴1-1-onto𝐵𝐷𝐵) → ((𝐹𝐷) = 𝐶 → (𝐹𝐶) = 𝐷))
873adant2 1123 . 2 ((𝐹:𝐴1-1-onto𝐵𝐶𝐴𝐷𝐵) → ((𝐹𝐷) = 𝐶 → (𝐹𝐶) = 𝐷))
92, 8impbid 213 1 ((𝐹:𝐴1-1-onto𝐵𝐶𝐴𝐷𝐵) → ((𝐹𝐶) = 𝐷 ↔ (𝐹𝐷) = 𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  w3a 1079   = wceq 1528  wcel 2105  ccnv 5547  1-1-ontowf1o 6347  cfv 6348
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ne 3014  df-ral 3140  df-rex 3141  df-rab 3144  df-v 3494  df-sbc 3770  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-br 5058  df-opab 5120  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356
This theorem is referenced by:  f1ofveu  7140  f1ocnvfv3  7141  1arith2  16252  f1omvdcnv  18501  f1omvdconj  18503  txhmeo  22339  iccpnfcnv  23475  dvcnvlem  24500  logeftb  25094  sqff1o  25686  bracnlnval  29818  cdlemg17h  37684  isomuspgrlem1  43869
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