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Substitution

In general, substitution is the replacement of one thing with another. There are many specific examples:

In organic chemistry, a reaction where one functional group takes the place of another. A major type of substitution is nucleophilic substitution.

The substitution cipher in cryptography.

The substitution rule in calculus.

Import substitution in trade.

The substitution method in the testing of optical fiber.

The substitution property of equality in mathematics.

This is a disambiguation page; that is, one that just points to other pages that might otherwise have the same name.

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