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Metamath Proof Explorer

Theorem 1tiei

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

Ref Expression
Assertion 1tiei ( 1 · i ) = i

Proof

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