Theorem exmo 2580

Description: Any proposition holds for some 𝑥 or holds for at most one 𝑥. (Contributed by NM, 8-Mar-1995.) Shorten proof and avoid df-eu 2614. (Revised by BJ, 14-Oct-2022.)

Assertion

Ref	Expression
exmo	⊢ (∃𝑥𝜑 ∨ ∃*𝑥𝜑)

Proof of Theorem exmo

Step	Hyp	Ref	Expression
1		nexmo 2579	. 2 ⊢ (¬ ∃𝑥𝜑 → ∃*𝑥𝜑)
2	1	orri 857	1 ⊢ (∃𝑥𝜑 ∨ ∃*𝑥𝜑)

Syntax hints:   ∨ wo 842  ∃wex 1765  ∃*wmo 2576

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1781  ax-4 1795  ax-5 1892  ax-6 1951

This theorem depends on definitions:  df-bi 208  df-or 843  df-ex 1766  df-mo 2578

This theorem is referenced by:  exmoeuOLD  2651  brdom3  9803  mofal  33368