Theorem rspc2 2887

Description: 2-variable restricted specialization, using implicit substitution. (Contributed by NM, 9-Nov-2012.)

Hypotheses

Ref	Expression
rspc2.1	⊢ Ⅎ𝑥𝜒
rspc2.2	⊢ Ⅎ𝑦𝜓
rspc2.3	⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜒))
rspc2.4	⊢ (𝑦 = 𝐵 → (𝜒 ↔ 𝜓))

Assertion

Ref	Expression
rspc2	⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → (∀𝑥 ∈ 𝐶 ∀𝑦 ∈ 𝐷 𝜑 → 𝜓))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑦,𝐵   𝑥,𝐶   𝑥,𝐷,𝑦

Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)   𝜒(𝑥,𝑦)   𝐵(𝑥)   𝐶(𝑦)

Proof of Theorem rspc2

Step	Hyp	Ref	Expression
1		nfcv 2347	. . . 4 ⊢ Ⅎ𝑥𝐷
2		rspc2.1	. . . 4 ⊢ Ⅎ𝑥𝜒
3	1, 2	nfralxy 2543	. . 3 ⊢ Ⅎ𝑥∀𝑦 ∈ 𝐷 𝜒
4		rspc2.3	. . . 4 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜒))
5	4	ralbidv 2505	. . 3 ⊢ (𝑥 = 𝐴 → (∀𝑦 ∈ 𝐷 𝜑 ↔ ∀𝑦 ∈ 𝐷 𝜒))
6	3, 5	rspc 2870	. 2 ⊢ (𝐴 ∈ 𝐶 → (∀𝑥 ∈ 𝐶 ∀𝑦 ∈ 𝐷 𝜑 → ∀𝑦 ∈ 𝐷 𝜒))
7		rspc2.2	. . 3 ⊢ Ⅎ𝑦𝜓
8		rspc2.4	. . 3 ⊢ (𝑦 = 𝐵 → (𝜒 ↔ 𝜓))
9	7, 8	rspc 2870	. 2 ⊢ (𝐵 ∈ 𝐷 → (∀𝑦 ∈ 𝐷 𝜒 → 𝜓))
10	6, 9	sylan9 409	1 ⊢ ((𝐴 ∈ 𝐶 ∧ 𝐵 ∈ 𝐷) → (∀𝑥 ∈ 𝐶 ∀𝑦 ∈ 𝐷 𝜑 → 𝜓))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1372  Ⅎwnf 1482   ∈ wcel 2175  ∀wral 2483

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-ext 2186

This theorem depends on definitions:  df-bi 117  df-tru 1375  df-nf 1483  df-sb 1785  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ral 2488  df-v 2773

This theorem is referenced by:  rspc2v  2889  disjiun  4038  dvmptfsum  15115