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Metamath Proof Explorer

Theorem 1cnd

Description: One is a complex number, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)

		Ref	Expression
	Assertion	1cnd	$⊢ φ \to 1 \in ℂ$

Step	Hyp	Ref	Expression
1		ax-1cn	$⊢ 1 \in ℂ$
2	1	a1i	$⊢ φ \to 1 \in ℂ$