Logical Agents

Outline: Inference

Proof methods

Inference by enumeration

Wumpus world sentences

Truth tables for inference

Proof methods

Reasoning Patterns in Prop Logic

Logical equivalence

Resolution

Resolution example

The power of false

Applying inference rules

Inference

Completeness

Resolution

Resolution

Completeness of Resolution

Completeness of Resolution (cont)

Forward and backward chaining

Forward chaining example

Forward chaining example

Forward chaining example

Proof of completeness

Backward chaining example

Backward chaining example

Backward chaining example

Proof methods

Efficient propositional inference

The DPLL algorithm

The DPLL algorithm

The WalkSAT algorithm

The WalkSAT algorithm

Hard satisfiability problems

Hard satisfiability problems

Hard satisfiability problems

Inference-based agents in the wumpus world

Slide 38

Expressiveness limitation of propositional logic

Summary