- #1
haael
- 539
- 35
I'm having problems with this statement in first-order logic with equality:
[tex]\forall x \exists y . x = y[/tex]
For every element x there exists element y equal to that one. This seems obviously correct.
My questions: Is this an axiom? If not, how to proove it from other equality axioms?
[tex]\forall x \exists y . x = y[/tex]
For every element x there exists element y equal to that one. This seems obviously correct.
My questions: Is this an axiom? If not, how to proove it from other equality axioms?