The Substitution reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

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.
• Substitute good in consumer theory.
• The substitution method in the testing of optical fiber.
• The substitution property of equality in mathematics.

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