Theorem sbc2iegf 3865

Description: Conversion of implicit substitution to explicit class substitution. (Contributed by Mario Carneiro, 19-Dec-2013.)

Hypotheses

Ref	Expression
sbc2iegf.1	⊢ Ⅎ𝑥𝜓
sbc2iegf.2	⊢ Ⅎ𝑦𝜓
sbc2iegf.3	⊢ Ⅎ𝑥 𝐵 ∈ 𝑊
sbc2iegf.4	⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓))

Assertion

Ref	Expression
sbc2iegf	⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑 ↔ 𝜓))

Distinct variable groups:   𝑥,𝑦,𝐴   𝑦,𝐵   𝑥,𝑉   𝑦,𝑊

Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦)   𝐵(𝑥)   𝑉(𝑦)   𝑊(𝑥)

Proof of Theorem sbc2iegf

Step	Hyp	Ref	Expression
1		simpl 482	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝐴 ∈ 𝑉)
2		simpl 482	. . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝑥 = 𝐴) → 𝐵 ∈ 𝑊)
3		sbc2iegf.4	. . . . 5 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓))
4	3	adantll 714	. . . 4 ⊢ (((𝐵 ∈ 𝑊 ∧ 𝑥 = 𝐴) ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓))
5		nfv 1914	. . . 4 ⊢ Ⅎ𝑦(𝐵 ∈ 𝑊 ∧ 𝑥 = 𝐴)
6		sbc2iegf.2	. . . . 5 ⊢ Ⅎ𝑦𝜓
7	6	a1i 11	. . . 4 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝑥 = 𝐴) → Ⅎ𝑦𝜓)
8	2, 4, 5, 7	sbciedf 3831	. . 3 ⊢ ((𝐵 ∈ 𝑊 ∧ 𝑥 = 𝐴) → ([𝐵 / 𝑦]𝜑 ↔ 𝜓))
9	8	adantll 714	. 2 ⊢ (((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) ∧ 𝑥 = 𝐴) → ([𝐵 / 𝑦]𝜑 ↔ 𝜓))
10		nfv 1914	. . 3 ⊢ Ⅎ𝑥 𝐴 ∈ 𝑉
11		sbc2iegf.3	. . 3 ⊢ Ⅎ𝑥 𝐵 ∈ 𝑊
12	10, 11	nfan 1899	. 2 ⊢ Ⅎ𝑥(𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊)
13		sbc2iegf.1	. . 3 ⊢ Ⅎ𝑥𝜓
14	13	a1i 11	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → Ⅎ𝑥𝜓)
15	1, 9, 12, 14	sbciedf 3831	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑 ↔ 𝜓))

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540  Ⅎwnf 1783   ∈ wcel 2108  [wsbc 3788

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-12 2177  ax-ext 2708

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-ex 1780  df-nf 1784  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-sbc 3789

This theorem is referenced by:  opelopabaf  5549  elmptrab  23835