Theorem ecoptocl 8811

Description: Implicit substitution of class for equivalence class of ordered pair. (Contributed by NM, 23-Jul-1995.)

Hypotheses

Ref	Expression
ecoptocl.1	⊢ 𝑆 = ((𝐵 × 𝐶) / 𝑅)
ecoptocl.2	⊢ ([⟨𝑥, 𝑦⟩]𝑅 = 𝐴 → (𝜑 ↔ 𝜓))
ecoptocl.3	⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶) → 𝜑)

Assertion

Ref	Expression
ecoptocl	⊢ (𝐴 ∈ 𝑆 → 𝜓)

Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐶,𝑦   𝑥,𝑅,𝑦   𝜓,𝑥,𝑦

Allowed substitution hints:   𝜑(𝑥, 𝑦)   𝑆(𝑥, 𝑦)

Proof of Theorem ecoptocl

Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		elqsi 8769	. . 3 ⊢ (𝐴 ∈ ((𝐵 × 𝐶) / 𝑅) → ∃𝑧 ∈ (𝐵 × 𝐶)𝐴 = [𝑧]𝑅)
2		eqid 2762	. . . . 5 ⊢ (𝐵 × 𝐶) = (𝐵 × 𝐶)
3		eceq1 8740	. . . . . . 7 ⊢ (⟨𝑥, 𝑦⟩ = 𝑧 → [⟨𝑥, 𝑦⟩]𝑅 = [𝑧]𝑅)
4	3	eqeq2d 2773	. . . . . 6 ⊢ (⟨𝑥, 𝑦⟩ = 𝑧 → (𝐴 = [⟨𝑥, 𝑦⟩]𝑅 ↔ 𝐴 = [𝑧]𝑅))
5	4	imbi1d 344	. . . . 5 ⊢ (⟨𝑥, 𝑦⟩ = 𝑧 → ((𝐴 = [⟨𝑥, 𝑦⟩]𝑅 → 𝜓) ↔ (𝐴 = [𝑧]𝑅 → 𝜓)))
6		ecoptocl.3	. . . . . 6 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶) → 𝜑)
7		ecoptocl.2	. . . . . . 7 ⊢ ([⟨𝑥, 𝑦⟩]𝑅 = 𝐴 → (𝜑 ↔ 𝜓))
8	7	eqcoms 2770	. . . . . 6 ⊢ (𝐴 = [⟨𝑥, 𝑦⟩]𝑅 → (𝜑 ↔ 𝜓))
9	6, 8	syl5ibcom 248	. . . . 5 ⊢ ((𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐶) → (𝐴 = [⟨𝑥, 𝑦⟩]𝑅 → 𝜓))
10	2, 5, 9	optocl 5753	. . . 4 ⊢ (𝑧 ∈ (𝐵 × 𝐶) → (𝐴 = [𝑧]𝑅 → 𝜓))
11	10	rexlimiv 3158	. . 3 ⊢ (∃𝑧 ∈ (𝐵 × 𝐶)𝐴 = [𝑧]𝑅 → 𝜓)
12	1, 11	syl 18	. 2 ⊢ (𝐴 ∈ ((𝐵 × 𝐶) / 𝑅) → 𝜓)
13		ecoptocl.1	. 2 ⊢ 𝑆 = ((𝐵 × 𝐶) / 𝑅)
14	12, 13	eleq2s 2880	1 ⊢ (𝐴 ∈ 𝑆 → 𝜓)

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   = wceq 1570   ∈ wcel 2145  ∃wrex 3088  ⟨cop 4593   × cxp 5657  [cec 8698   / cqs 8699

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2734

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2741  df-cleq 2754  df-clel 2837  df-rex 3089  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-sn 4588  df-pr 4590  df-op 4594  df-br 5108  df-opab 5172  df-xp 5665  df-cnv 5667  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-ec 8702  df-qs 8706

This theorem is used by:  2ecoptocl  8812  3ecoptocl  8813  0idsr  11110  1idsr  11111  00sr  11112  recexsrlem  11116  map2psrpr  11123