Theorem id1 28850

Description: Alias for idALT 23 that may be referenced in some older works, and kept here to prevent broken links.

If you landed here, please let the originating site and/or us know that the link that made you land here should be changed to a link to idALT 23.

(Contributed by NM, 30-Sep-1992.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
id1	⊢ (𝜑 → 𝜑)

Proof of Theorem id1

Step	Hyp	Ref	Expression
1		idALT 23	1 ⊢ (𝜑 → 𝜑)

Syntax hints:   → wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7

This theorem is referenced by: (None)