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Metamath Proof Explorer

Theorem 1red

Description: The number 1 is real, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)

		Ref	Expression
	Assertion	1red	$⊢ φ \to 1 \in ℝ$

Step	Hyp	Ref	Expression
1		1re	$⊢ 1 \in ℝ$
2	1	a1i	$⊢ φ \to 1 \in ℝ$