Substitution

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Substitution is the replacement of one thing with another. Specific types include:

In mathematics:

Substitution rule, in calculus
The substitution method of solving simultaneous equations
Substitution property of equality, in mathematics
Substitution cipher, in cryptography
Variable substitution method in lambda calculus and mathematical logic

In science and technology:

Substitution (chemistry), in organic chemistry
Substitution method, in the testing of optical fiber
Substitution mutation is synonymous with point mutation in genetics
Virtual Reality as a substitute for Reality

In economics:

Import substitution in trade
Substitute good, in consumer theory

In medicine:

Substitution therapy for opiates

In Analytic psychology:

It is a defence mechanism where a person replaces one feeling or emotion for another.

Other uses:

Chord substitution, in music
Substitution (law), a legal right to change a judge that may be biased.
Substitution (theatre), an acting methodology
Substitutes, in sport
Substitutionary Covenantal Representation in Biblical Theology

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