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Metamath Proof Explorer

Theorem mofal

Description: There exist at most one set such that F. is true. (Contributed by Anthony Hart, 13-Sep-2011)

		Ref	Expression
	Assertion	mofal	$⊢ \exists^{*} x ⊥$

Step	Hyp	Ref	Expression
1		nexfal	$⊢ \neg \exists x ⊥$
2		exmo	$⊢ (\exists x ⊥ \lor \exists^{*} x ⊥)$
3	1 2	mtpor	$⊢ \exists^{*} x ⊥$