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Metamath Proof Explorer

Theorem it1ei

Description: _i times 1 equals _i . (Contributed by SN, 25-Apr-2025)

Ref Expression
Assertion it1ei 
|- ( _i x. 1 ) = _i

Proof

Step Hyp Ref Expression
1 ax-icn 
 |-  _i e. CC
2 1 mulridi 
 |-  ( _i x. 1 ) = _i