Theorem raaanlem 3346

Description: Special case of raaan 3347 where 𝐴 is inhabited. (Contributed by Jim Kingdon, 6-Aug-2018.)

Hypotheses

Ref	Expression
raaan.1	⊢ Ⅎ𝑦𝜑
raaan.2	⊢ Ⅎ𝑥𝜓

Assertion

Ref	Expression
raaanlem	⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝜑 ∧ 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))

Distinct variable group:   𝑥,𝑦,𝐴

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

Proof of Theorem raaanlem

Step	Hyp	Ref	Expression
1		eleq1 2141	. . . 4 ⊢ (𝑥 = 𝑦 → (𝑥 ∈ 𝐴 ↔ 𝑦 ∈ 𝐴))
2	1	cbvexv 1836	. . 3 ⊢ (∃𝑥 𝑥 ∈ 𝐴 ↔ ∃𝑦 𝑦 ∈ 𝐴)
3		raaan.1	. . . . 5 ⊢ Ⅎ𝑦𝜑
4	3	r19.28m 3331	. . . 4 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (∀𝑦 ∈ 𝐴 (𝜑 ∧ 𝜓) ↔ (𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))
5	4	ralbidv 2368	. . 3 ⊢ (∃𝑦 𝑦 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝜑 ∧ 𝜓) ↔ ∀𝑥 ∈ 𝐴 (𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))
6	2, 5	sylbi 119	. 2 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝜑 ∧ 𝜓) ↔ ∀𝑥 ∈ 𝐴 (𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))
7		nfcv 2219	. . . 4 ⊢ Ⅎ𝑥𝐴
8		raaan.2	. . . 4 ⊢ Ⅎ𝑥𝜓
9	7, 8	nfralxy 2402	. . 3 ⊢ Ⅎ𝑥∀𝑦 ∈ 𝐴 𝜓
10	9	r19.27m 3336	. 2 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 (𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))
11	6, 10	bitrd 186	1 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 (𝜑 ∧ 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 ∧ ∀𝑦 ∈ 𝐴 𝜓)))

Syntax hints:   → wi 4   ∧ wa 102   ↔ wb 103  Ⅎwnf 1389  ∃wex 1421   ∈ wcel 1433  ∀wral 2348

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353

This theorem is referenced by:  raaan  3347