Solved

1. (∀X)(∀y)(Bxy ≡ Dyx)

Question 137

Multiple Choice

1. (∀x) (∀y) (Bxy ≡ Dyx)
2. (∃x) Bxf(x)
-Which of the following propositions is derivable from the given premises in FF?

A) Daa
B) (∃x) Dxx
C) Df(x) f(x)
D) (∃x) Df(x) x
E) (∀x) Df(x) x

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