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There is one creator (at least one, maybe more).
Ahura Mazda is the one and only creator.
∃y( Creator(a) ∧ ∀x( Creator(x) → x=a )
All squares are broken.
∀x( Sqr(x) → Brkn(x) )
There is one and only one creator.
∃y( Creator(y) ∧ ∀x( Creator(x) → x=y ) )
∃y( ∀x( Creator(x) ↔ x=y ) )
Ex: There is one and only one female creator.
Ex: There is one and only one creator and she is female.