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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	⊢ ∃* 𝑥 ⊥

Step	Hyp	Ref	Expression
1		nexfal	⊢ ¬ ∃ 𝑥 ⊥
2		exmo	⊢ ( ∃ 𝑥 ⊥ ∨ ∃* 𝑥 ⊥ )
3	1 2	mtpor	⊢ ∃* 𝑥 ⊥