Theorem spvwOLD 1989

Description: Obsolete version of spvw 1984 as of 20-Oct-2023. (Contributed by NM, 10-Apr-2017.) (Proof shortened by Wolf Lammen, 4-Dec-2017.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
spvwOLD	⊢ (∀𝑥𝜑 → 𝜑)

Distinct variable group:   𝜑,𝑥

Proof of Theorem spvwOLD

Step	Hyp	Ref	Expression
1		19.3v 1985	. 2 ⊢ (∀𝑥𝜑 ↔ 𝜑)
2	1	biimpi 218	1 ⊢ (∀𝑥𝜑 → 𝜑)

Syntax hints:   → wi 4  ∀wal 1534

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 1969

This theorem depends on definitions:  df-bi 209  df-ex 1780

This theorem is referenced by: (None)