funcoppc5 - Mathbox for Zhi Wang

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Theorem funcoppc5 49245

Description: A functor on opposite categories yields a functor on the original categories. (Contributed by Zhi Wang, 14-Nov-2025.)

**Hypotheses**
Ref	Expression
funcoppc2.o	⊢ 𝑂 = (oppCat‘𝐶)
funcoppc2.p	⊢ 𝑃 = (oppCat‘𝐷)
funcoppc2.c	⊢ (𝜑 → 𝐶 ∈ 𝑉)
funcoppc2.d	⊢ (𝜑 → 𝐷 ∈ 𝑊)
funcoppc5.f	⊢ (𝜑 → ( oppFunc ‘𝐹) ∈ (𝑂 Func 𝑃))

**Assertion**
Ref	Expression
funcoppc5	⊢ (𝜑 → 𝐹 ∈ (𝐶 Func 𝐷))

**Proof of Theorem funcoppc5**
Step	Hyp	Ref	Expression
1		funcoppc5.f	. . . 4 ⊢ (𝜑 → ( oppFunc ‘𝐹) ∈ (𝑂 Func 𝑃))
2		relfunc 17769	. . . 4 ⊢ Rel (𝑂 Func 𝑃)
3		eqid 2731	. . . 4 ⊢ ( oppFunc ‘𝐹) = ( oppFunc ‘𝐹)
4	1, 2, 3	oppfrcl 49228	. . 3 ⊢ (𝜑 → 𝐹 ∈ (V × V))
5		1st2nd2 7960	. . 3 ⊢ (𝐹 ∈ (V × V) → 𝐹 = ⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩)
6	4, 5	syl 17	. 2 ⊢ (𝜑 → 𝐹 = ⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩)
7		funcoppc2.o	. . . 4 ⊢ 𝑂 = (oppCat‘𝐶)
8		funcoppc2.p	. . . 4 ⊢ 𝑃 = (oppCat‘𝐷)
9		funcoppc2.c	. . . 4 ⊢ (𝜑 → 𝐶 ∈ 𝑉)
10		funcoppc2.d	. . . 4 ⊢ (𝜑 → 𝐷 ∈ 𝑊)
11	6	fveq2d 6826	. . . . . 6 ⊢ (𝜑 → ( oppFunc ‘𝐹) = ( oppFunc ‘⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩))
12		df-ov 7349	. . . . . 6 ⊢ ((1^st ‘𝐹) oppFunc (2^nd ‘𝐹)) = ( oppFunc ‘⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩)
13	11, 12	eqtr4di 2784	. . . . 5 ⊢ (𝜑 → ( oppFunc ‘𝐹) = ((1^st ‘𝐹) oppFunc (2^nd ‘𝐹)))
14	13, 1	eqeltrrd 2832	. . . 4 ⊢ (𝜑 → ((1^st ‘𝐹) oppFunc (2^nd ‘𝐹)) ∈ (𝑂 Func 𝑃))
15	7, 8, 9, 10, 14	funcoppc4 49244	. . 3 ⊢ (𝜑 → (1^st ‘𝐹)(𝐶 Func 𝐷)(2^nd ‘𝐹))
16		df-br 5090	. . 3 ⊢ ((1^st ‘𝐹)(𝐶 Func 𝐷)(2^nd ‘𝐹) ↔ ⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩ ∈ (𝐶 Func 𝐷))
17	15, 16	sylib 218	. 2 ⊢ (𝜑 → ⟨(1^st ‘𝐹), (2^nd ‘𝐹)⟩ ∈ (𝐶 Func 𝐷))
18	6, 17	eqeltrd 2831	1 ⊢ (𝜑 → 𝐹 ∈ (𝐶 Func 𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2111 Vcvv 3436 ⟨cop 4579 class class class wbr 5089 × cxp 5612 ‘cfv 6481 (class class class)co 7346 1^st c1st 7919 2^nd c2nd 7920 oppCatcoppc 17617 Func cfunc 17761 oppFunc coppf 49222

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5215 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-tr 5197 df-id 5509 df-eprel 5514 df-po 5522 df-so 5523 df-fr 5567 df-we 5569 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-1st 7921 df-2nd 7922 df-tpos 8156 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-er 8622 df-map 8752 df-ixp 8822 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-nn 12126 df-2 12188 df-3 12189 df-4 12190 df-5 12191 df-6 12192 df-7 12193 df-8 12194 df-9 12195 df-n0 12382 df-z 12469 df-dec 12589 df-sets 17075 df-slot 17093 df-ndx 17105 df-base 17121 df-hom 17185 df-cco 17186 df-cat 17574 df-cid 17575 df-homf 17576 df-comf 17577 df-oppc 17618 df-func 17765 df-oppf 49223

This theorem is referenced by: oppfuprcl 49304 natoppfb 49331 lmddu 49767 cmddu 49768

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