Metamath Proof Explorer

Theorem id1

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

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

Ref Expression
Assertion id1 ( 𝜑𝜑 )


Step Hyp Ref Expression
1 idALT ( 𝜑𝜑 )