dvhvaddcbv - Mathbox for Norm Megill

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Theorem dvhvaddcbv 41078

Description: Change bound variables to isolate them later. (Contributed by NM, 3-Nov-2013.)

**Hypothesis**
Ref	Expression
dvhvaddval.a	⊢ + = (𝑓 ∈ (𝑇 × 𝐸), 𝑔 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘𝑓) ∘ (1^st ‘𝑔)), ((2^nd ‘𝑓) ⨣ (2^nd ‘𝑔))⟩)

**Assertion**
Ref	Expression
dvhvaddcbv	⊢ + = (ℎ ∈ (𝑇 × 𝐸), 𝑖 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑖)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑖))⟩)

Distinct variable groups: 𝑓,𝑔,ℎ,𝑖,𝐸 ⨣ ,𝑓,𝑔,ℎ,𝑖 𝑇,𝑓,𝑔,ℎ,𝑖 Allowed substitution hints: + (𝑓,𝑔,ℎ,𝑖)

**Proof of Theorem dvhvaddcbv**
Step	Hyp	Ref	Expression
1		dvhvaddval.a	. 2 ⊢ + = (𝑓 ∈ (𝑇 × 𝐸), 𝑔 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘𝑓) ∘ (1^st ‘𝑔)), ((2^nd ‘𝑓) ⨣ (2^nd ‘𝑔))⟩)
2		fveq2 6822	. . . . 5 ⊢ (𝑓 = ℎ → (1^st ‘𝑓) = (1^st ‘ℎ))
3	2	coeq1d 5804	. . . 4 ⊢ (𝑓 = ℎ → ((1^st ‘𝑓) ∘ (1^st ‘𝑔)) = ((1^st ‘ℎ) ∘ (1^st ‘𝑔)))
4		fveq2 6822	. . . . 5 ⊢ (𝑓 = ℎ → (2^nd ‘𝑓) = (2^nd ‘ℎ))
5	4	oveq1d 7364	. . . 4 ⊢ (𝑓 = ℎ → ((2^nd ‘𝑓) ⨣ (2^nd ‘𝑔)) = ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑔)))
6	3, 5	opeq12d 4832	. . 3 ⊢ (𝑓 = ℎ → ⟨((1^st ‘𝑓) ∘ (1^st ‘𝑔)), ((2^nd ‘𝑓) ⨣ (2^nd ‘𝑔))⟩ = ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑔)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑔))⟩)
7		fveq2 6822	. . . . 5 ⊢ (𝑔 = 𝑖 → (1^st ‘𝑔) = (1^st ‘𝑖))
8	7	coeq2d 5805	. . . 4 ⊢ (𝑔 = 𝑖 → ((1^st ‘ℎ) ∘ (1^st ‘𝑔)) = ((1^st ‘ℎ) ∘ (1^st ‘𝑖)))
9		fveq2 6822	. . . . 5 ⊢ (𝑔 = 𝑖 → (2^nd ‘𝑔) = (2^nd ‘𝑖))
10	9	oveq2d 7365	. . . 4 ⊢ (𝑔 = 𝑖 → ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑔)) = ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑖)))
11	8, 10	opeq12d 4832	. . 3 ⊢ (𝑔 = 𝑖 → ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑔)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑔))⟩ = ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑖)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑖))⟩)
12	6, 11	cbvmpov 7444	. 2 ⊢ (𝑓 ∈ (𝑇 × 𝐸), 𝑔 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘𝑓) ∘ (1^st ‘𝑔)), ((2^nd ‘𝑓) ⨣ (2^nd ‘𝑔))⟩) = (ℎ ∈ (𝑇 × 𝐸), 𝑖 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑖)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑖))⟩)
13	1, 12	eqtri 2752	1 ⊢ + = (ℎ ∈ (𝑇 × 𝐸), 𝑖 ∈ (𝑇 × 𝐸) ↦ ⟨((1^st ‘ℎ) ∘ (1^st ‘𝑖)), ((2^nd ‘ℎ) ⨣ (2^nd ‘𝑖))⟩)

Colors of variables: wff setvar class

Syntax hints: = wceq 1540 ⟨cop 4583 × cxp 5617 ∘ ccom 5623 ‘cfv 6482 (class class class)co 7349 ∈ cmpo 7351 1^st c1st 7922 2^nd c2nd 7923

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-ext 2701

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-sb 2066 df-clab 2708 df-cleq 2721 df-clel 2803 df-rab 3395 df-v 3438 df-dif 3906 df-un 3908 df-ss 3920 df-nul 4285 df-if 4477 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4859 df-br 5093 df-opab 5155 df-co 5628 df-iota 6438 df-fv 6490 df-ov 7352 df-oprab 7353 df-mpo 7354

This theorem is referenced by: dvhvaddval 41079

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