Substitution

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Origin

Middle English substitucion, from Middle French, from Late Latin substitution-, substitutio, from substituere

Definitions

  • 1:a. The putting of one person or thing in place of another.

b: With reference to the principle in religious sacrifices of replacing one kind of victim by another or a bloody by an unbloody offering.

b. The operation of passing from the primitive arrangement of n letters to any other arrangement of the same letters.
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Description

In mathematics, substitution of variables (also called variable substitution or coordinate transformation) refers to the substitution of certain variables with other variables. Though the study of how variable substitutions affect a certain problem can be interesting in itself, they are often used when solving mathematical or physical problems, as the correct substitution may greatly simplify a problem which is hard to solve in the original variables. Under certain conditions the solution to the original problem can be recovered by back-substitution (inverting the substitution).