...like.

Thus the heuristics of a chess program that represents ``My opponent has an open file for his rooks.'' by a sentence will be different from those of a present program which at most represents the phenomenon by the value of a numerical co-efficient in an evaluation function.

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...limitations.

Science fiction and scientific and philosophical speculation have often indulged in the Laplacian fantasy of super beings able to predict the future by knowing the positions and velocities of all the particles. That isn't the direction to go. Rather they would be better at using the information that is available to the senses.

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...defined.

Regarding a concept as intrinsically approximate is distinct from either regarding it as fully defined by nature or fully defined by human convention.

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