This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

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