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Metamath Proof Explorer

Theorem 4m1e3

Description: 4 - 1 = 3. (Contributed by AV, 8-Feb-2021) (Proof shortened by AV, 6-Sep-2021)

		Ref	Expression
	Assertion	4m1e3	$⊢ 4 - 1 = 3$

Step	Hyp	Ref	Expression
1		3cn	$⊢ 3 \in ℂ$
2		ax-1cn	$⊢ 1 \in ℂ$
3		df-4	$⊢ 4 = 3 + 1$
4	1 2 3	mvrraddi	$⊢ 4 - 1 = 3$