Unification in FOL — AI Technical Interview Questions & Answers

Unification in FOL

Unification in FOL

  • Unification finds substitutions that make two FOL expressions look the same. Knows(John, x) and Knows(John, Jane) unify with {x/Jane}. Occurs check stops x unifying with f(x). No unifier? fail.
  • It is the engine inside resolution and Prolog-style matching. Tiny pair on the board is the whole exam.
  • Output: idea / do / check for Unification in FOL. Fill those three in the viva.

Technical Interview Tip: One successful unify + one fail.

Code Examples for Unification in FOL

Example

# Unification in FOL
print("idea :", "Unification in FOL")
print("do   : one tiny example on paper")
print("check: one failure case")

Output: idea / do / check for Unification in FOL. Fill those three in the viva.

How to Explain Unification in FOL to an Interviewer

Explain Unification in FOL as if you are teaching a junior — definition, then one example.

Substitution so two terms match. occurs check.

What does the example print, and what does that prove?

idea / do / check for Unification in FOL

What mistake do freshers make with Unification in FOL?

Only the buzzword, no example