The only daughter Robert has is Esther.
A) (x)(Dxr ⊃ e = e)
B) Der • (x)(Dxr ⊃ x = e)
C) Der
D) Der • (x)(x = e ⊃ Der)
E) (∃x)(Dxr • x = e)

Question

Quizplus · Accepted Answer

The statement "The only daughter Robert has is Esther" can be logically represented as "Robert has a daughter, and if anyone is Robert's daughter, then that person is Esther." This is captured by Der • (x)(Dxr ⊃ x = e), where Der indicates Esther is Robert's daughter, and (x)(Dxr ⊃ x = e) indicates that if anyone is Robert's daughter, then that person is Esther.

The Only Daughter Robert Has Is Esther