Theorem rmo2i 3132

Description: Condition implying restricted "at most one." (Contributed by NM, 17-Jun-2017.)

Hypothesis

Ref	Expression
rmo2.1	|- F/yph

Assertion

Ref	Expression
rmo2i	|- (E.y e. A A.x e. A (ph -> x = y) -> E*x e. A ph)

Distinct variable group:   x,y,A

Allowed substitution hints:   ph(x,y)

Proof of Theorem rmo2i

Step	Hyp	Ref	Expression
1		rexex 2673	. 2 |- (E.y e. A A.x e. A (ph -> x = y) -> E.yA.x e. A (ph -> x = y))
2		rmo2.1	. . 3 |- F/yph
3	2	rmo2 3131	. 2 |- (E*x e. A ph <-> E.yA.x e. A (ph -> x = y))
4	1, 3	sylibr 203	1 |- (E.y e. A A.x e. A (ph -> x = y) -> E*x e. A ph)

Syntax hints:   -> wi 4  E.wex 1541   F/wnf 1544  A.wral 2614  E.wrex 2615  E*wrmo 2617

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-ral 2619  df-rex 2620  df-rmo 2622

This theorem is referenced by: (None)