Theorem bnj1171 30322

Description: Technical lemma for bnj69 30332. This lemma may no longer be used or have become an indirect lemma of the theorem in question (i.e. a lemma of a lemma... of the theorem). (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)

Hypotheses

Ref	Expression
bnj1171.13	⊢ ((𝜑 ∧ 𝜓) → 𝐵 ⊆ 𝐴)
bnj1171.129	⊢ ∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵))))

Assertion

Ref	Expression
bnj1171	⊢ ∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧)))

Proof of Theorem bnj1171

Step	Hyp	Ref	Expression
1		bnj1171.129	. 2 ⊢ ∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵))))
2		bnj1171.13	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝜓) → 𝐵 ⊆ 𝐴)
3	2	sseld 3567	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝜓) → (𝑤 ∈ 𝐵 → 𝑤 ∈ 𝐴))
4	3	pm4.71rd 665	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝜓) → (𝑤 ∈ 𝐵 ↔ (𝑤 ∈ 𝐴 ∧ 𝑤 ∈ 𝐵)))
5	4	imbi1d 330	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝜓) → ((𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧) ↔ ((𝑤 ∈ 𝐴 ∧ 𝑤 ∈ 𝐵) → ¬ 𝑤𝑅𝑧)))
6		impexp 461	. . . . . . . 8 ⊢ (((𝑤 ∈ 𝐴 ∧ 𝑤 ∈ 𝐵) → ¬ 𝑤𝑅𝑧) ↔ (𝑤 ∈ 𝐴 → (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧)))
7	5, 6	syl6bb 275	. . . . . . 7 ⊢ ((𝜑 ∧ 𝜓) → ((𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧) ↔ (𝑤 ∈ 𝐴 → (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧))))
8		con2b 348	. . . . . . . 8 ⊢ ((𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵) ↔ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧))
9	8	imbi2i 325	. . . . . . 7 ⊢ ((𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵)) ↔ (𝑤 ∈ 𝐴 → (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧)))
10	7, 9	syl6bbr 277	. . . . . 6 ⊢ ((𝜑 ∧ 𝜓) → ((𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧) ↔ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵))))
11	10	anbi2d 736	. . . . 5 ⊢ ((𝜑 ∧ 𝜓) → ((𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧)) ↔ (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵)))))
12	11	pm5.74i 259	. . . 4 ⊢ (((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧))) ↔ ((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵)))))
13	12	albii 1737	. . 3 ⊢ (∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧))) ↔ ∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵)))))
14	13	exbii 1764	. 2 ⊢ (∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧))) ↔ ∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐴 → (𝑤𝑅𝑧 → ¬ 𝑤 ∈ 𝐵)))))
15	1, 14	mpbir 220	1 ⊢ ∃𝑧∀𝑤((𝜑 ∧ 𝜓) → (𝑧 ∈ 𝐵 ∧ (𝑤 ∈ 𝐵 → ¬ 𝑤𝑅𝑧)))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383  ∀wal 1473  ∃wex 1695   ∈ wcel 1977   ⊆ wss 3540   class class class wbr 4583

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-in 3547  df-ss 3554

This theorem is referenced by:  bnj1190  30330