Theorem isoco 16437

Description: The composition of two isomorphisms is an isomorphism. Proposition 3.14(2) of [Adamek] p. 29. (Contributed by Mario Carneiro, 2-Jan-2017.)

Hypotheses

Ref	Expression
isoco.b	⊢ 𝐵 = (Base‘𝐶)
isoco.o	⊢ · = (comp‘𝐶)
isoco.n	⊢ 𝐼 = (Iso‘𝐶)
isoco.c	⊢ (𝜑 → 𝐶 ∈ Cat)
isoco.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
isoco.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
isoco.z	⊢ (𝜑 → 𝑍 ∈ 𝐵)
isoco.f	⊢ (𝜑 → 𝐹 ∈ (𝑋𝐼𝑌))
isoco.g	⊢ (𝜑 → 𝐺 ∈ (𝑌𝐼𝑍))

Assertion

Ref	Expression
isoco	⊢ (𝜑 → (𝐺(⟨𝑋, 𝑌⟩ · 𝑍)𝐹) ∈ (𝑋𝐼𝑍))

Proof of Theorem isoco

Step	Hyp	Ref	Expression
1		isoco.b	. 2 ⊢ 𝐵 = (Base‘𝐶)
2		eqid 2622	. 2 ⊢ (Inv‘𝐶) = (Inv‘𝐶)
3		isoco.c	. 2 ⊢ (𝜑 → 𝐶 ∈ Cat)
4		isoco.x	. 2 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
5		isoco.z	. 2 ⊢ (𝜑 → 𝑍 ∈ 𝐵)
6		isoco.n	. 2 ⊢ 𝐼 = (Iso‘𝐶)
7		isoco.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
8		isoco.f	. . 3 ⊢ (𝜑 → 𝐹 ∈ (𝑋𝐼𝑌))
9		isoco.o	. . 3 ⊢ · = (comp‘𝐶)
10		isoco.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ (𝑌𝐼𝑍))
11	1, 2, 3, 4, 7, 6, 8, 9, 5, 10	invco 16431	. 2 ⊢ (𝜑 → (𝐺(⟨𝑋, 𝑌⟩ · 𝑍)𝐹)(𝑋(Inv‘𝐶)𝑍)(((𝑋(Inv‘𝐶)𝑌)‘𝐹)(⟨𝑍, 𝑌⟩ · 𝑋)((𝑌(Inv‘𝐶)𝑍)‘𝐺)))
12	1, 2, 3, 4, 5, 6, 11	inviso1 16426	1 ⊢ (𝜑 → (𝐺(⟨𝑋, 𝑌⟩ · 𝑍)𝐹) ∈ (𝑋𝐼𝑍))

Syntax hints:   → wi 4   = wceq 1483   ∈ wcel 1990  ⟨cop 4183  ‘cfv 5888  (class class class)co 6650  Basecbs 15857  compcco 15953  Catccat 16325  Invcinv 16405  Isociso 16406

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1st 7168  df-2nd 7169  df-cat 16329  df-cid 16330  df-sect 16407  df-inv 16408  df-iso 16409

This theorem is referenced by:  cictr  16465