Theorem alsbid 17051

Description: Deduction form of alsbii 17049. (Contributed by David A. Wheeler, 12-Jul-2026.)

Hypotheses

Ref	Expression
alsbid.1	⊢ Ⅎ𝑥𝜑
alsbid.2	⊢ (𝜑 → (𝜓 ↔ 𝜃))
alsbid.3	⊢ (𝜑 → (𝜒 ↔ 𝜏))

Assertion

Ref	Expression
alsbid	⊢ (𝜑 → (∀∃𝑥(𝜓 → 𝜒) ↔ ∀∃𝑥(𝜃 → 𝜏)))

Proof of Theorem alsbid

Step	Hyp	Ref	Expression
1		alsbid.1	. . . 4 ⊢ Ⅎ𝑥𝜑
2		alsbid.2	. . . . 5 ⊢ (𝜑 → (𝜓 ↔ 𝜃))
3		alsbid.3	. . . . 5 ⊢ (𝜑 → (𝜒 ↔ 𝜏))
4	2, 3	imbi12d 234	. . . 4 ⊢ (𝜑 → ((𝜓 → 𝜒) ↔ (𝜃 → 𝜏)))
5	1, 4	albid 1668	. . 3 ⊢ (𝜑 → (∀𝑥(𝜓 → 𝜒) ↔ ∀𝑥(𝜃 → 𝜏)))
6	1, 2	exbid 1669	. . 3 ⊢ (𝜑 → (∃𝑥𝜓 ↔ ∃𝑥𝜃))
7	5, 6	anbi12d 477	. 2 ⊢ (𝜑 → ((∀𝑥(𝜓 → 𝜒) ∧ ∃𝑥𝜓) ↔ (∀𝑥(𝜃 → 𝜏) ∧ ∃𝑥𝜃)))
8		df-als 17036	. 2 ⊢ (∀∃𝑥(𝜓 → 𝜒) ↔ (∀𝑥(𝜓 → 𝜒) ∧ ∃𝑥𝜓))
9		df-als 17036	. 2 ⊢ (∀∃𝑥(𝜃 → 𝜏) ↔ (∀𝑥(𝜃 → 𝜏) ∧ ∃𝑥𝜃))
10	7, 8, 9	3bitr4g 223	1 ⊢ (𝜑 → (∀∃𝑥(𝜓 → 𝜒) ↔ ∀∃𝑥(𝜃 → 𝜏)))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105  ∀wal 1400  Ⅎwnf 1513  ∃wex 1545  ∀∃wals 17034

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-5 1500  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-4 1563  ax-ial 1587

This theorem depends on definitions:  df-bi 117  df-nf 1514  df-als 17036

This theorem is referenced by: (None)