Artificial intelligence
What is Transposition rule?

From P → Q, infer ~Q → ~P
From P → Q, infer Q → ~P
From P → Q, infer ~Q → P
From P → Q, infer Q → P

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Artificial intelligence
What is a heuristic function?

A function which takes parameters of type string and returns an integer value
A function that maps from problem state descriptions to measures of desirability
A function whose return type is nothing
A function to solve mathematical problems

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