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Metamath Proof Explorer

Theorem exan

Description: Place a conjunct in the scope of an existential quantifier. (Contributed by NM, 18-Aug-1993) (Proof shortened by Andrew Salmon, 25-May-2011) (Proof shortened by Wolf Lammen, 13-Jan-2018) Reduce axiom dependencies. (Revised by BJ, 7-Jul-2021) (Proof shortened by Wolf Lammen, 6-Nov-2022) Expand hypothesis. (Revised by Steven Nguyen, 19-Jun-2023)

	Ref	Expression
Hypotheses	exan.1	$⊢ \exists x φ$
	exan.2	$⊢ ψ$
Assertion	exan	$⊢ \exists x (φ \land ψ)$

Proof

Step	Hyp	Ref	Expression
1		exan.1	$⊢ \exists x φ$
2		exan.2	$⊢ ψ$
3	2	jctr	$⊢ φ \to (φ \land ψ)$
4	1 3	eximii	$⊢ \exists x (φ \land ψ)$