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Chapter 09:
INFERENCE IN FIRST-ORDER LOGIC

ARTIFICIAL INTELLIGENCE MODERN APPROACH

Chapter Audio

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Visual Summaries

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Table Summary

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Core Terminology

Master key academic terminology through active recall and spaced repetition concepts.

Universal Instantiation (UI)

What inference rule allows the replacement of a universally quantified variable with any ground term?

Skolem constant

What is the term for a new constant symbol introduced during Existential Instantiation to replace an existentially quantified variable?

inferentially

In the context of Existential Instantiation, the resulting knowledge base is not logically equivalent but _____ equivalent to the original.

semidecidable

First-order logic entailment is _____, meaning algorithms can identify every entailed sentence but cannot always identify non-entailed ones.

Unification

The process of finding substitutions that make different logical expressions look identical.

Most General Unifier (MGU)

What is the name for a unifier that places the fewest possible restrictions on the values of variables?

Chapter Quiz

When performing unification, why is 'standardizing apart' necessary?

What is the function of the 'occur check' during the unification process?

The Rete algorithm is primarily used to improve the efficiency of which process?

In Prolog, what is the function of the 'trail' during the execution of a program?

Which of the following describes the 'set of support' strategy in resolution?

Answers: C, C, D, D, D

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