Theorem f1ocnvfv 2921

Description: Relationship between the value of a one-to-one onto function and the value of its converse. (Contributed by Raph Levien, 10-Apr-04.)

Assertion

Ref	Expression
f1ocnvfv	⊢ ((F:A–1-1-onto→B ∧ C ∈ A) → ((F ‘C) = D → (◡F ‘D) = C))

Proof of Theorem f1ocnvfv

Step	Hyp	Ref	Expression
1		f1ocnvfv1 2919	. . 3 ⊢ ((F:A–1-1-onto→B ∧ C ∈ A) → (◡F ‘(F ‘C)) = C)
2	1	cleq2d 1112	. 2 ⊢ ((F:A–1-1-onto→B ∧ C ∈ A) → ((◡F ‘D) = (◡F ‘(F ‘C)) ↔ (◡F ‘D) = C))
3		fveq2 2832	. . 3 ⊢ (D = (F ‘C) → (◡F ‘D) = (◡F ‘(F ‘C)))
4	3	cleqcoms 1104	. 2 ⊢ ((F ‘C) = D → (◡F ‘D) = (◡F ‘(F ‘C)))
5	2, 4	syl5bi 183	1 ⊢ ((F:A–1-1-onto→B ∧ C ∈ A) → ((F ‘C) = D → (◡F ‘D) = C))

Syntax hints:   → wi 2   ∧ wa 196   = wceq 1091   ∈ wcel 1092  ^◡ccnv 2409  –1-1-onto→wf1o 2421   ‘cfv 2422

This theorem is referenced by:  f1ocnvfvb 2922  uzrdgini 4658  uzrdgsuc 4659

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-un 1076  ax-pow 1077

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-rex 1206  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-br 2063  df-opab 2098  df-id 2125  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-f 2434  df-f1 2435  df-fo 2436  df-f1o 2437  df-fv 2438

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