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MMLU / Two expressions E and F are said to be unifiable if there are substitutions for…

Problem

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question

Two expressions E and F are said to be unifiable if there are substitutions for the variables of E and F that make the expressions lexically identical. In the following three expressions, only w, x, y, and z are variables.
I. f(w,w)
II. f(x,1)
III. f(y,g(z))
Which pairs of these expressions is (are) pairs of unifiable expressions?

choices

  1. (I, II) only
  2. (I, III) only
  3. (II, III) only
  4. (I, II) and (I, III) only

subject

college_computer_science

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