Theorem ssralvOLD 4052

Description: Obsolete version of ssralv 4048 as of 19-May-2025. (Contributed by NM, 11-Mar-2006.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
ssralvOLD	⊢ (𝐴 ⊆ 𝐵 → (∀𝑥 ∈ 𝐵 𝜑 → ∀𝑥 ∈ 𝐴 𝜑))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem ssralvOLD

Step	Hyp	Ref	Expression
1		ssel 3973	. . 3 ⊢ (𝐴 ⊆ 𝐵 → (𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵))
2	1	imim1d 82	. 2 ⊢ (𝐴 ⊆ 𝐵 → ((𝑥 ∈ 𝐵 → 𝜑) → (𝑥 ∈ 𝐴 → 𝜑)))
3	2	ralimdv2 3153	1 ⊢ (𝐴 ⊆ 𝐵 → (∀𝑥 ∈ 𝐵 𝜑 → ∀𝑥 ∈ 𝐴 𝜑))

Syntax hints:   → wi 4   ∈ wcel 2099  ∀wral 3051   ⊆ wss 3947

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101

This theorem depends on definitions:  df-bi 206  df-an 395  df-ex 1775  df-clel 2803  df-ral 3052  df-ss 3964

This theorem is referenced by: (None)