Theorem moaneu 2657

Description: Nested at-most-one and unique existential quantifiers. (Contributed by NM, 25-Jan-2006.) (Proof shortened by Wolf Lammen, 27-Dec-2018.)

Assertion

Ref	Expression
moaneu	⊢ ∃*𝑥(𝜑 ∧ ∃!𝑥𝜑)

Proof of Theorem moaneu

Step	Hyp	Ref	Expression
1		moanmo 2656	. 2 ⊢ ∃*𝑥(𝜑 ∧ ∃*𝑥𝜑)
2		eumo 2612	. . . 4 ⊢ (∃!𝑥𝜑 → ∃*𝑥𝜑)
3	2	anim2i 628	. . 3 ⊢ ((𝜑 ∧ ∃!𝑥𝜑) → (𝜑 ∧ ∃*𝑥𝜑))
4	3	moimi 2579	. 2 ⊢ (∃*𝑥(𝜑 ∧ ∃*𝑥𝜑) → ∃*𝑥(𝜑 ∧ ∃!𝑥𝜑))
5	1, 4	ax-mp 5	1 ⊢ ∃*𝑥(𝜑 ∧ ∃!𝑥𝜑)

Syntax hints:   ∧ wa 400  ∃*wmo 2571  ∃!weu 2602

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-10 2182  ax-11 2198  ax-12 2219

This theorem depends on definitions:  df-bi 210  df-an 401  df-ex 1807  df-nf 1811  df-mo 2573  df-eu 2603

This theorem is referenced by: (None)