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Theorem ffthiso 17876

Description: A fully faithful functor reflects isomorphisms. Corollary 3.32 of [Adamek] p. 35. (Contributed by Mario Carneiro, 27-Jan-2017.)

**Hypotheses**
Ref	Expression
fthmon.b	⊢ 𝐵 = (Base‘𝐶)
fthmon.h	⊢ 𝐻 = (Hom ‘𝐶)
fthmon.f	⊢ (𝜑 → 𝐹(𝐶 Faith 𝐷)𝐺)
fthmon.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
fthmon.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
fthmon.r	⊢ (𝜑 → 𝑅 ∈ (𝑋𝐻𝑌))
ffthiso.f	⊢ (𝜑 → 𝐹(𝐶 Full 𝐷)𝐺)
ffthiso.s	⊢ 𝐼 = (Iso‘𝐶)
ffthiso.t	⊢ 𝐽 = (Iso‘𝐷)

**Assertion**
Ref	Expression
ffthiso	⊢ (𝜑 → (𝑅 ∈ (𝑋𝐼𝑌) ↔ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))))

Proof of Theorem ffthiso Dummy variable 𝑓 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fthmon.b	. . 3 ⊢ 𝐵 = (Base‘𝐶)
2		ffthiso.s	. . 3 ⊢ 𝐼 = (Iso‘𝐶)
3		ffthiso.t	. . 3 ⊢ 𝐽 = (Iso‘𝐷)
4		fthmon.f	. . . . 5 ⊢ (𝜑 → 𝐹(𝐶 Faith 𝐷)𝐺)
5		fthfunc 17854	. . . . . 6 ⊢ (𝐶 Faith 𝐷) ⊆ (𝐶 Func 𝐷)
6	5	ssbri 5192	. . . . 5 ⊢ (𝐹(𝐶 Faith 𝐷)𝐺 → 𝐹(𝐶 Func 𝐷)𝐺)
7	4, 6	syl 17	. . . 4 ⊢ (𝜑 → 𝐹(𝐶 Func 𝐷)𝐺)
8	7	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑅 ∈ (𝑋𝐼𝑌)) → 𝐹(𝐶 Func 𝐷)𝐺)
9		fthmon.x	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
10	9	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑅 ∈ (𝑋𝐼𝑌)) → 𝑋 ∈ 𝐵)
11		fthmon.y	. . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
12	11	adantr 482	. . 3 ⊢ ((𝜑 ∧ 𝑅 ∈ (𝑋𝐼𝑌)) → 𝑌 ∈ 𝐵)
13		simpr 486	. . 3 ⊢ ((𝜑 ∧ 𝑅 ∈ (𝑋𝐼𝑌)) → 𝑅 ∈ (𝑋𝐼𝑌))
14	1, 2, 3, 8, 10, 12, 13	funciso 17820	. 2 ⊢ ((𝜑 ∧ 𝑅 ∈ (𝑋𝐼𝑌)) → ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌)))
15		eqid 2733	. . . 4 ⊢ (Inv‘𝐶) = (Inv‘𝐶)
16		df-br 5148	. . . . . . . 8 ⊢ (𝐹(𝐶 Func 𝐷)𝐺 ↔ ⟨𝐹, 𝐺⟩ ∈ (𝐶 Func 𝐷))
17	7, 16	sylib 217	. . . . . . 7 ⊢ (𝜑 → ⟨𝐹, 𝐺⟩ ∈ (𝐶 Func 𝐷))
18		funcrcl 17809	. . . . . . 7 ⊢ (⟨𝐹, 𝐺⟩ ∈ (𝐶 Func 𝐷) → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
19	17, 18	syl 17	. . . . . 6 ⊢ (𝜑 → (𝐶 ∈ Cat ∧ 𝐷 ∈ Cat))
20	19	simpld 496	. . . . 5 ⊢ (𝜑 → 𝐶 ∈ Cat)
21	20	ad3antrrr 729	. . . 4 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝐶 ∈ Cat)
22	9	ad3antrrr 729	. . . 4 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑋 ∈ 𝐵)
23	11	ad3antrrr 729	. . . 4 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑌 ∈ 𝐵)
24		eqid 2733	. . . . . . . . . . 11 ⊢ (Base‘𝐷) = (Base‘𝐷)
25		eqid 2733	. . . . . . . . . . 11 ⊢ (Inv‘𝐷) = (Inv‘𝐷)
26	19	simprd 497	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐷 ∈ Cat)
27	1, 24, 7	funcf1 17812	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐹:𝐵⟶(Base‘𝐷))
28	27, 9	ffvelcdmd 7083	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹‘𝑋) ∈ (Base‘𝐷))
29	27, 11	ffvelcdmd 7083	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹‘𝑌) ∈ (Base‘𝐷))
30	24, 25, 26, 28, 29, 3	isoval 17708	. . . . . . . . . 10 ⊢ (𝜑 → ((𝐹‘𝑋)𝐽(𝐹‘𝑌)) = dom ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)))
31	30	eleq2d 2820	. . . . . . . . 9 ⊢ (𝜑 → (((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌)) ↔ ((𝑋𝐺𝑌)‘𝑅) ∈ dom ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))))
32	31	biimpa 478	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → ((𝑋𝐺𝑌)‘𝑅) ∈ dom ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)))
33	24, 25, 26, 28, 29	invfun 17707	. . . . . . . . . 10 ⊢ (𝜑 → Fun ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)))
34	33	adantr 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → Fun ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)))
35		funfvbrb 7048	. . . . . . . . 9 ⊢ (Fun ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)) → (((𝑋𝐺𝑌)‘𝑅) ∈ dom ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)) ↔ ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))(((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅))))
36	34, 35	syl 17	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → (((𝑋𝐺𝑌)‘𝑅) ∈ dom ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)) ↔ ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))(((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅))))
37	32, 36	mpbid 231	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))(((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)))
38	37	ad2antrr 725	. . . . . 6 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))(((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)))
39		simpr 486	. . . . . 6 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓))
40	38, 39	breqtrd 5173	. . . . 5 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))((𝑌𝐺𝑋)‘𝑓))
41		fthmon.h	. . . . . 6 ⊢ 𝐻 = (Hom ‘𝐶)
42	4	ad3antrrr 729	. . . . . 6 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝐹(𝐶 Faith 𝐷)𝐺)
43		fthmon.r	. . . . . . 7 ⊢ (𝜑 → 𝑅 ∈ (𝑋𝐻𝑌))
44	43	ad3antrrr 729	. . . . . 6 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑅 ∈ (𝑋𝐻𝑌))
45		simplr 768	. . . . . 6 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑓 ∈ (𝑌𝐻𝑋))
46	1, 41, 42, 22, 23, 44, 45, 15, 25	fthinv 17873	. . . . 5 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → (𝑅(𝑋(Inv‘𝐶)𝑌)𝑓 ↔ ((𝑋𝐺𝑌)‘𝑅)((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))((𝑌𝐺𝑋)‘𝑓)))
47	40, 46	mpbird 257	. . . 4 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑅(𝑋(Inv‘𝐶)𝑌)𝑓)
48	1, 15, 21, 22, 23, 2, 47	inviso1 17709	. . 3 ⊢ ((((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) ∧ 𝑓 ∈ (𝑌𝐻𝑋)) ∧ (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓)) → 𝑅 ∈ (𝑋𝐼𝑌))
49		eqid 2733	. . . 4 ⊢ (Hom ‘𝐷) = (Hom ‘𝐷)
50		ffthiso.f	. . . . 5 ⊢ (𝜑 → 𝐹(𝐶 Full 𝐷)𝐺)
51	50	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → 𝐹(𝐶 Full 𝐷)𝐺)
52	11	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → 𝑌 ∈ 𝐵)
53	9	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → 𝑋 ∈ 𝐵)
54	24, 49, 3, 26, 29, 28	isohom 17719	. . . . . 6 ⊢ (𝜑 → ((𝐹‘𝑌)𝐽(𝐹‘𝑋)) ⊆ ((𝐹‘𝑌)(Hom ‘𝐷)(𝐹‘𝑋)))
55	54	adantr 482	. . . . 5 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → ((𝐹‘𝑌)𝐽(𝐹‘𝑋)) ⊆ ((𝐹‘𝑌)(Hom ‘𝐷)(𝐹‘𝑋)))
56	24, 25, 26, 28, 29, 3	invf 17711	. . . . . 6 ⊢ (𝜑 → ((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌)):((𝐹‘𝑋)𝐽(𝐹‘𝑌))⟶((𝐹‘𝑌)𝐽(𝐹‘𝑋)))
57	56	ffvelcdmda 7082	. . . . 5 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) ∈ ((𝐹‘𝑌)𝐽(𝐹‘𝑋)))
58	55, 57	sseldd 3982	. . . 4 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → (((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) ∈ ((𝐹‘𝑌)(Hom ‘𝐷)(𝐹‘𝑋)))
59	1, 49, 41, 51, 52, 53, 58	fulli 17860	. . 3 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → ∃𝑓 ∈ (𝑌𝐻𝑋)(((𝐹‘𝑋)(Inv‘𝐷)(𝐹‘𝑌))‘((𝑋𝐺𝑌)‘𝑅)) = ((𝑌𝐺𝑋)‘𝑓))
60	48, 59	r19.29a 3163	. 2 ⊢ ((𝜑 ∧ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))) → 𝑅 ∈ (𝑋𝐼𝑌))
61	14, 60	impbida 800	1 ⊢ (𝜑 → (𝑅 ∈ (𝑋𝐼𝑌) ↔ ((𝑋𝐺𝑌)‘𝑅) ∈ ((𝐹‘𝑋)𝐽(𝐹‘𝑌))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ⊆ wss 3947 ⟨cop 4633 class class class wbr 5147 dom cdm 5675 Fun wfun 6534 ‘cfv 6540 (class class class)co 7404 Basecbs 17140 Hom chom 17204 Catccat 17604 Invcinv 17688 Isociso 17689 Func cfunc 17800 Full cful 17849 Faith cfth 17850

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-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7720

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-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-id 5573 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-1st 7970 df-2nd 7971 df-map 8818 df-ixp 8888 df-cat 17608 df-cid 17609 df-sect 17690 df-inv 17691 df-iso 17692 df-func 17804 df-full 17851 df-fth 17852

This theorem is referenced by: (None)

W3C validator