MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  moa1 Structured version   Visualization version   GIF version

Theorem moa1 2628
Description: If an implication holds for at most one value, then its consequent holds for at most one value. See also ala1 1805 and exa1 1829. (Contributed by NM, 28-Jul-1995.) (Proof shortened by Wolf Lammen, 22-Dec-2018.) (Revised by BJ, 29-Mar-2021.)
Assertion
Ref Expression
moa1 (∃*𝑥(𝜑𝜓) → ∃*𝑥𝜓)

Proof of Theorem moa1
StepHypRef Expression
1 ax-1 6 . 2 (𝜓 → (𝜑𝜓))
21moimi 2620 1 (∃*𝑥(𝜑𝜓) → ∃*𝑥𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  ∃*wmo 2613
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801
This theorem depends on definitions:  df-bi 208  df-ex 1772  df-mo 2615
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator