Metamath Proof Explorer


Theorem idiALT

Description: Placeholder for idi . Though unnecessary, this theorem is sometimes used in proofs in this mathbox for pedagogical purposes. (Contributed by Alan Sare, 31-Dec-2011) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Hypothesis idiALT.1
|- ph
Assertion idiALT
|- ph

Proof

Step Hyp Ref Expression
1 idiALT.1
 |-  ph