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Theorem ecoptocl 6600
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 → (𝜑𝜓))
ecoptocl.3 ((𝑥𝐵𝑦𝐶) → 𝜑)
Assertion
Ref Expression
ecoptocl (𝐴𝑆𝜓)
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.
StepHypRef Expression
1 elqsi 6565 . . 3 (𝐴 ∈ ((𝐵 × 𝐶) / 𝑅) → ∃𝑧 ∈ (𝐵 × 𝐶)𝐴 = [𝑧]𝑅)
2 eqid 2170 . . . . 5 (𝐵 × 𝐶) = (𝐵 × 𝐶)
3 eceq1 6548 . . . . . . 7 (⟨𝑥, 𝑦⟩ = 𝑧 → [⟨𝑥, 𝑦⟩]𝑅 = [𝑧]𝑅)
43eqeq2d 2182 . . . . . 6 (⟨𝑥, 𝑦⟩ = 𝑧 → (𝐴 = [⟨𝑥, 𝑦⟩]𝑅𝐴 = [𝑧]𝑅))
54imbi1d 230 . . . . 5 (⟨𝑥, 𝑦⟩ = 𝑧 → ((𝐴 = [⟨𝑥, 𝑦⟩]𝑅𝜓) ↔ (𝐴 = [𝑧]𝑅𝜓)))
6 ecoptocl.3 . . . . . 6 ((𝑥𝐵𝑦𝐶) → 𝜑)
7 ecoptocl.2 . . . . . . 7 ([⟨𝑥, 𝑦⟩]𝑅 = 𝐴 → (𝜑𝜓))
87eqcoms 2173 . . . . . 6 (𝐴 = [⟨𝑥, 𝑦⟩]𝑅 → (𝜑𝜓))
96, 8syl5ibcom 154 . . . . 5 ((𝑥𝐵𝑦𝐶) → (𝐴 = [⟨𝑥, 𝑦⟩]𝑅𝜓))
102, 5, 9optocl 4687 . . . 4 (𝑧 ∈ (𝐵 × 𝐶) → (𝐴 = [𝑧]𝑅𝜓))
1110rexlimiv 2581 . . 3 (∃𝑧 ∈ (𝐵 × 𝐶)𝐴 = [𝑧]𝑅𝜓)
121, 11syl 14 . 2 (𝐴 ∈ ((𝐵 × 𝐶) / 𝑅) → 𝜓)
13 ecoptocl.1 . 2 𝑆 = ((𝐵 × 𝐶) / 𝑅)
1412, 13eleq2s 2265 1 (𝐴𝑆𝜓)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wb 104   = wceq 1348  wcel 2141  wrex 2449  cop 3586   × cxp 4609  [cec 6511   / cqs 6512
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-br 3990  df-opab 4051  df-xp 4617  df-cnv 4619  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-ec 6515  df-qs 6519
This theorem is referenced by:  2ecoptocl  6601  3ecoptocl  6602  mulidnq  7351  recexnq  7352  ltsonq  7360  distrnq0  7421  addassnq0  7424  ltposr  7725  0idsr  7729  1idsr  7730  00sr  7731  recexgt0sr  7735  archsr  7744  srpospr  7745  map2psrprg  7767
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