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Theorem s3iunsndisj 13753
Description: The union of singletons consisting of length 3 strings which have distinct first and third symbols are disjunct. (Contributed by AV, 17-May-2021.)
Assertion
Ref Expression
s3iunsndisj (𝐵𝑋Disj 𝑎𝑌 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩})
Distinct variable groups:   𝐵,𝑐   𝑋,𝑐   𝑌,𝑐   𝑍,𝑐   𝐵,𝑎,𝑐   𝑋,𝑎   𝑌,𝑎   𝑍,𝑎

Proof of Theorem s3iunsndisj
Dummy variables 𝑑 𝑒 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 orc 399 . . . . 5 (𝑎 = 𝑑 → (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅))
21a1d 25 . . . 4 (𝑎 = 𝑑 → ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅)))
3 eliun 4556 . . . . . . . . . 10 (𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ↔ ∃𝑐 ∈ (𝑍 ∖ {𝑎})𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩})
4 velsn 4226 . . . . . . . . . . . . . . . . . 18 (𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩} ↔ 𝑠 = ⟨“𝑎𝐵𝑐”⟩)
5 eqeq1 2655 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → (𝑠 = ⟨“𝑑𝐵𝑒”⟩ ↔ ⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩))
65adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) ∧ 𝑠 = ⟨“𝑎𝐵𝑐”⟩) → (𝑠 = ⟨“𝑑𝐵𝑒”⟩ ↔ ⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩))
7 s3cli 13672 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⟨“𝑎𝐵𝑐”⟩ ∈ Word V
8 elex 3243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝐵𝑋𝐵 ∈ V)
9 elex 3243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝑑𝑌𝑑 ∈ V)
109adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ((𝑎𝑌𝑑𝑌) → 𝑑 ∈ V)
118, 10anim12ci 590 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → (𝑑 ∈ V ∧ 𝐵 ∈ V))
12 elex 3243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝑒 ∈ (𝑍 ∖ {𝑑}) → 𝑒 ∈ V)
1312adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → 𝑒 ∈ V)
1411, 13anim12i 589 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) → ((𝑑 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑒 ∈ V))
15 df-3an 1056 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ((𝑑 ∈ V ∧ 𝐵 ∈ V ∧ 𝑒 ∈ V) ↔ ((𝑑 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑒 ∈ V))
1614, 15sylibr 224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) → (𝑑 ∈ V ∧ 𝐵 ∈ V ∧ 𝑒 ∈ V))
17 eqwrds3 13750 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((⟨“𝑎𝐵𝑐”⟩ ∈ Word V ∧ (𝑑 ∈ V ∧ 𝐵 ∈ V ∧ 𝑒 ∈ V)) → (⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩ ↔ ((#‘⟨“𝑎𝐵𝑐”⟩) = 3 ∧ ((⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑 ∧ (⟨“𝑎𝐵𝑐”⟩‘1) = 𝐵 ∧ (⟨“𝑎𝐵𝑐”⟩‘2) = 𝑒))))
187, 16, 17sylancr 696 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) → (⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩ ↔ ((#‘⟨“𝑎𝐵𝑐”⟩) = 3 ∧ ((⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑 ∧ (⟨“𝑎𝐵𝑐”⟩‘1) = 𝐵 ∧ (⟨“𝑎𝐵𝑐”⟩‘2) = 𝑒))))
19 vex 3234 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 𝑎 ∈ V
20 s3fv0 13682 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (𝑎 ∈ V → (⟨“𝑎𝐵𝑐”⟩‘0) = 𝑎)
2119, 20ax-mp 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (⟨“𝑎𝐵𝑐”⟩‘0) = 𝑎
22 simp1 1081 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (((⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑 ∧ (⟨“𝑎𝐵𝑐”⟩‘1) = 𝐵 ∧ (⟨“𝑎𝐵𝑐”⟩‘2) = 𝑒) → (⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑)
2321, 22syl5eqr 2699 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (((⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑 ∧ (⟨“𝑎𝐵𝑐”⟩‘1) = 𝐵 ∧ (⟨“𝑎𝐵𝑐”⟩‘2) = 𝑒) → 𝑎 = 𝑑)
2423adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (((#‘⟨“𝑎𝐵𝑐”⟩) = 3 ∧ ((⟨“𝑎𝐵𝑐”⟩‘0) = 𝑑 ∧ (⟨“𝑎𝐵𝑐”⟩‘1) = 𝐵 ∧ (⟨“𝑎𝐵𝑐”⟩‘2) = 𝑒)) → 𝑎 = 𝑑)
2518, 24syl6bi 243 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) → (⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩ → 𝑎 = 𝑑))
2625adantr 480 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) ∧ 𝑠 = ⟨“𝑎𝐵𝑐”⟩) → (⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩ → 𝑎 = 𝑑))
276, 26sylbid 230 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑}))) ∧ 𝑠 = ⟨“𝑎𝐵𝑐”⟩) → (𝑠 = ⟨“𝑑𝐵𝑒”⟩ → 𝑎 = 𝑑))
2827ancoms 468 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑠 = ⟨“𝑎𝐵𝑐”⟩ ∧ ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})))) → (𝑠 = ⟨“𝑑𝐵𝑒”⟩ → 𝑎 = 𝑑))
2928con3d 148 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑠 = ⟨“𝑎𝐵𝑐”⟩ ∧ ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) ∧ (𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})))) → (¬ 𝑎 = 𝑑 → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))
3029exp32 630 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → ((𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → (¬ 𝑎 = 𝑑 → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))))
3130com14 96 . . . . . . . . . . . . . . . . . . . . . 22 𝑎 = 𝑑 → ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → ((𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))))
3231imp 444 . . . . . . . . . . . . . . . . . . . . 21 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → ((𝑐 ∈ (𝑍 ∖ {𝑎}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩)))
3332expd 451 . . . . . . . . . . . . . . . . . . . 20 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → (𝑐 ∈ (𝑍 ∖ {𝑎}) → (𝑒 ∈ (𝑍 ∖ {𝑑}) → (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))))
3433com34 91 . . . . . . . . . . . . . . . . . . 19 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → (𝑐 ∈ (𝑍 ∖ {𝑎}) → (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → (𝑒 ∈ (𝑍 ∖ {𝑑}) → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))))
3534imp 444 . . . . . . . . . . . . . . . . . 18 (((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) → (𝑠 = ⟨“𝑎𝐵𝑐”⟩ → (𝑒 ∈ (𝑍 ∖ {𝑑}) → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩)))
364, 35syl5bi 232 . . . . . . . . . . . . . . . . 17 (((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) → (𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩} → (𝑒 ∈ (𝑍 ∖ {𝑑}) → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩)))
3736imp 444 . . . . . . . . . . . . . . . 16 ((((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩}) → (𝑒 ∈ (𝑍 ∖ {𝑑}) → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩))
3837imp 444 . . . . . . . . . . . . . . 15 (((((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → ¬ 𝑠 = ⟨“𝑑𝐵𝑒”⟩)
39 velsn 4226 . . . . . . . . . . . . . . 15 (𝑠 ∈ {⟨“𝑑𝐵𝑒”⟩} ↔ 𝑠 = ⟨“𝑑𝐵𝑒”⟩)
4038, 39sylnibr 318 . . . . . . . . . . . . . 14 (((((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩}) ∧ 𝑒 ∈ (𝑍 ∖ {𝑑})) → ¬ 𝑠 ∈ {⟨“𝑑𝐵𝑒”⟩})
4140nrexdv 3030 . . . . . . . . . . . . 13 ((((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩}) → ¬ ∃𝑒 ∈ (𝑍 ∖ {𝑑})𝑠 ∈ {⟨“𝑑𝐵𝑒”⟩})
42 eliun 4556 . . . . . . . . . . . . 13 (𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩} ↔ ∃𝑒 ∈ (𝑍 ∖ {𝑑})𝑠 ∈ {⟨“𝑑𝐵𝑒”⟩})
4341, 42sylnibr 318 . . . . . . . . . . . 12 ((((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) ∧ 𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩}) → ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩})
4443ex 449 . . . . . . . . . . 11 (((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) ∧ 𝑐 ∈ (𝑍 ∖ {𝑎})) → (𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩} → ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩}))
4544rexlimdva 3060 . . . . . . . . . 10 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → (∃𝑐 ∈ (𝑍 ∖ {𝑎})𝑠 ∈ {⟨“𝑎𝐵𝑐”⟩} → ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩}))
463, 45syl5bi 232 . . . . . . . . 9 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → (𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} → ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩}))
4746ralrimiv 2994 . . . . . . . 8 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → ∀𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩})
48 eqidd 2652 . . . . . . . . . . . . . 14 (𝑐 = 𝑒𝑑 = 𝑑)
49 eqidd 2652 . . . . . . . . . . . . . 14 (𝑐 = 𝑒𝐵 = 𝐵)
50 id 22 . . . . . . . . . . . . . 14 (𝑐 = 𝑒𝑐 = 𝑒)
5148, 49, 50s3eqd 13655 . . . . . . . . . . . . 13 (𝑐 = 𝑒 → ⟨“𝑑𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑒”⟩)
5251sneqd 4222 . . . . . . . . . . . 12 (𝑐 = 𝑒 → {⟨“𝑑𝐵𝑐”⟩} = {⟨“𝑑𝐵𝑒”⟩})
5352cbviunv 4591 . . . . . . . . . . 11 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩} = 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩}
5453eleq2i 2722 . . . . . . . . . 10 (𝑠 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩} ↔ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩})
5554notbii 309 . . . . . . . . 9 𝑠 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩} ↔ ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩})
5655ralbii 3009 . . . . . . . 8 (∀𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ¬ 𝑠 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩} ↔ ∀𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ¬ 𝑠 𝑒 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑒”⟩})
5747, 56sylibr 224 . . . . . . 7 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → ∀𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ¬ 𝑠 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩})
58 disj 4050 . . . . . . 7 (( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅ ↔ ∀𝑠 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ¬ 𝑠 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩})
5957, 58sylibr 224 . . . . . 6 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅)
6059olcd 407 . . . . 5 ((¬ 𝑎 = 𝑑 ∧ (𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌))) → (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅))
6160ex 449 . . . 4 𝑎 = 𝑑 → ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅)))
622, 61pm2.61i 176 . . 3 ((𝐵𝑋 ∧ (𝑎𝑌𝑑𝑌)) → (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅))
6362ralrimivva 3000 . 2 (𝐵𝑋 → ∀𝑎𝑌𝑑𝑌 (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅))
64 sneq 4220 . . . . 5 (𝑎 = 𝑑 → {𝑎} = {𝑑})
6564difeq2d 3761 . . . 4 (𝑎 = 𝑑 → (𝑍 ∖ {𝑎}) = (𝑍 ∖ {𝑑}))
66 id 22 . . . . . 6 (𝑎 = 𝑑𝑎 = 𝑑)
67 eqidd 2652 . . . . . 6 (𝑎 = 𝑑𝐵 = 𝐵)
68 eqidd 2652 . . . . . 6 (𝑎 = 𝑑𝑐 = 𝑐)
6966, 67, 68s3eqd 13655 . . . . 5 (𝑎 = 𝑑 → ⟨“𝑎𝐵𝑐”⟩ = ⟨“𝑑𝐵𝑐”⟩)
7069sneqd 4222 . . . 4 (𝑎 = 𝑑 → {⟨“𝑎𝐵𝑐”⟩} = {⟨“𝑑𝐵𝑐”⟩})
7165, 70iuneq12d 4578 . . 3 (𝑎 = 𝑑 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} = 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩})
7271disjor 4666 . 2 (Disj 𝑎𝑌 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ↔ ∀𝑎𝑌𝑑𝑌 (𝑎 = 𝑑 ∨ ( 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩} ∩ 𝑐 ∈ (𝑍 ∖ {𝑑}){⟨“𝑑𝐵𝑐”⟩}) = ∅))
7363, 72sylibr 224 1 (𝐵𝑋Disj 𝑎𝑌 𝑐 ∈ (𝑍 ∖ {𝑎}){⟨“𝑎𝐵𝑐”⟩})
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3a 1054   = wceq 1523  wcel 2030  wral 2941  wrex 2942  Vcvv 3231  cdif 3604  cin 3606  c0 3948  {csn 4210   ciun 4552  Disj wdisj 4652  cfv 5926  0cc0 9974  1c1 9975  2c2 11108  3c3 11109  #chash 13157  Word cword 13323  ⟨“cs3 13633
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-disj 4653  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-card 8803  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-nn 11059  df-2 11117  df-3 11118  df-n0 11331  df-z 11416  df-uz 11726  df-fz 12365  df-fzo 12505  df-hash 13158  df-word 13331  df-concat 13333  df-s1 13334  df-s2 13639  df-s3 13640
This theorem is referenced by:  fusgreghash2wspv  27315
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