Metamath Proof Explorer


Theorem it1ei

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

Ref Expression
Assertion it1ei ( i · 1 ) = i

Proof

Step Hyp Ref Expression
1 ax-icn i ∈ ℂ
2 1 mulridi ( i · 1 ) = i