Theorem axi9 2785

Description: Axiom of existence (intuitionistic logic axiom ax-i9). In classical logic, this is equivalent to ax-6 1964 but in intuitionistic logic it needs to be stated using the existential quantifier. (Contributed by Jim Kingdon, 31-Dec-2017.) (New usage is discouraged.)

Assertion

Ref	Expression
axi9	⊢ ∃𝑥 𝑥 = 𝑦

Proof of Theorem axi9

Step	Hyp	Ref	Expression
1		ax6e 2395	1 ⊢ ∃𝑥 𝑥 = 𝑦

Syntax hints:  ∃wex 1774

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1905  ax-6 1964  ax-7 2009  ax-12 2170  ax-13 2384

This theorem depends on definitions:  df-bi 209  df-an 399  df-ex 1775

This theorem is referenced by: (None)