Theorem funcnvres2 6612

Description: The converse of a restriction of the converse of a function equals the function restricted to the image of its converse. (Contributed by NM, 4-May-2005.)

Assertion

Ref	Expression
funcnvres2	⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (𝐹 ↾ (◡𝐹 “ 𝐴)))

Proof of Theorem funcnvres2

Step	Hyp	Ref	Expression
1		funcnvcnv 6599	. . 3 ⊢ (Fun 𝐹 → Fun ◡◡𝐹)
2		funcnvres 6610	. . 3 ⊢ (Fun ◡◡𝐹 → ◡(◡𝐹 ↾ 𝐴) = (◡◡𝐹 ↾ (◡𝐹 “ 𝐴)))
3	1, 2	syl 18	. 2 ⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (◡◡𝐹 ↾ (◡𝐹 “ 𝐴)))
4		funrel 6548	. . . 4 ⊢ (Fun 𝐹 → Rel 𝐹)
5		dfrel2 6180	. . . 4 ⊢ (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹)
6	4, 5	sylib 221	. . 3 ⊢ (Fun 𝐹 → ◡◡𝐹 = 𝐹)
7	6	reseq1d 5969	. 2 ⊢ (Fun 𝐹 → (◡◡𝐹 ↾ (◡𝐹 “ 𝐴)) = (𝐹 ↾ (◡𝐹 “ 𝐴)))
8	3, 7	eqtrd 2796	1 ⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (𝐹 ↾ (◡𝐹 “ 𝐴)))

This proof depends on syntax axioms:   → wi 4   = wceq 1570  ^◡ccnv 5650   ↾ cres 5653   “ cima 5654  Rel wrel 5656  Fun wfun 6525

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-fun 6533

This theorem is used by:  funimacnv  6613  foimacnv  6834  unbenlem  17066  ofco2  22746  dvlog  26961  fresf1o  33207  fressupp  33263