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Theorem invf 17737

Description: The inverse relation is a function from isomorphisms to isomorphisms. (Contributed by Mario Carneiro, 2-Jan-2017.)

**Hypotheses**
Ref	Expression
invfval.b	⊢ 𝐵 = (Base‘𝐶)
invfval.n	⊢ 𝑁 = (Inv‘𝐶)
invfval.c	⊢ (𝜑 → 𝐶 ∈ Cat)
invss.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
invss.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
isoval.n	⊢ 𝐼 = (Iso‘𝐶)

**Assertion**
Ref	Expression
invf	⊢ (𝜑 → (𝑋𝑁𝑌):(𝑋𝐼𝑌)⟶(𝑌𝐼𝑋))

**Proof of Theorem invf**
Step	Hyp	Ref	Expression
1		invfval.b	. . . . 5 ⊢ 𝐵 = (Base‘𝐶)
2		invfval.n	. . . . 5 ⊢ 𝑁 = (Inv‘𝐶)
3		invfval.c	. . . . 5 ⊢ (𝜑 → 𝐶 ∈ Cat)
4		invss.x	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
5		invss.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
6	1, 2, 3, 4, 5	invfun 17733	. . . 4 ⊢ (𝜑 → Fun (𝑋𝑁𝑌))
7	6	funfnd 6550	. . 3 ⊢ (𝜑 → (𝑋𝑁𝑌) Fn dom (𝑋𝑁𝑌))
8		isoval.n	. . . . 5 ⊢ 𝐼 = (Iso‘𝐶)
9	1, 2, 3, 4, 5, 8	isoval 17734	. . . 4 ⊢ (𝜑 → (𝑋𝐼𝑌) = dom (𝑋𝑁𝑌))
10	9	fneq2d 6615	. . 3 ⊢ (𝜑 → ((𝑋𝑁𝑌) Fn (𝑋𝐼𝑌) ↔ (𝑋𝑁𝑌) Fn dom (𝑋𝑁𝑌)))
11	7, 10	mpbird 257	. 2 ⊢ (𝜑 → (𝑋𝑁𝑌) Fn (𝑋𝐼𝑌))
12		df-rn 5652	. . . 4 ⊢ ran (𝑋𝑁𝑌) = dom ^◡(𝑋𝑁𝑌)
13	1, 2, 3, 4, 5	invsym2 17732	. . . . . 6 ⊢ (𝜑 → ^◡(𝑋𝑁𝑌) = (𝑌𝑁𝑋))
14	13	dmeqd 5872	. . . . 5 ⊢ (𝜑 → dom ^◡(𝑋𝑁𝑌) = dom (𝑌𝑁𝑋))
15	1, 2, 3, 5, 4, 8	isoval 17734	. . . . 5 ⊢ (𝜑 → (𝑌𝐼𝑋) = dom (𝑌𝑁𝑋))
16	14, 15	eqtr4d 2768	. . . 4 ⊢ (𝜑 → dom ^◡(𝑋𝑁𝑌) = (𝑌𝐼𝑋))
17	12, 16	eqtrid 2777	. . 3 ⊢ (𝜑 → ran (𝑋𝑁𝑌) = (𝑌𝐼𝑋))
18		eqimss 4008	. . 3 ⊢ (ran (𝑋𝑁𝑌) = (𝑌𝐼𝑋) → ran (𝑋𝑁𝑌) ⊆ (𝑌𝐼𝑋))
19	17, 18	syl 17	. 2 ⊢ (𝜑 → ran (𝑋𝑁𝑌) ⊆ (𝑌𝐼𝑋))
20		df-f 6518	. 2 ⊢ ((𝑋𝑁𝑌):(𝑋𝐼𝑌)⟶(𝑌𝐼𝑋) ↔ ((𝑋𝑁𝑌) Fn (𝑋𝐼𝑌) ∧ ran (𝑋𝑁𝑌) ⊆ (𝑌𝐼𝑋)))
21	11, 19, 20	sylanbrc 583	1 ⊢ (𝜑 → (𝑋𝑁𝑌):(𝑋𝐼𝑌)⟶(𝑌𝐼𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2109 ⊆ wss 3917 ^◡ccnv 5640 dom cdm 5641 ran crn 5642 Fn wfn 6509 ⟶wf 6510 ‘cfv 6514 (class class class)co 7390 Basecbs 17186 Catccat 17632 Invcinv 17714 Isociso 17715

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rmo 3356 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-id 5536 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-riota 7347 df-ov 7393 df-oprab 7394 df-mpo 7395 df-1st 7971 df-2nd 7972 df-cat 17636 df-cid 17637 df-sect 17716 df-inv 17717 df-iso 17718

This theorem is referenced by: invf1o 17738 invisoinvl 17759 invcoisoid 17761 isocoinvid 17762 rcaninv 17763 ffthiso 17900 initoeu2lem1 17983 upeu2lem 49021 thincciso3 49449

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