Invariant



[in-vair-ee-uh nt] /ɪnˈvɛər i ənt/

adjective
1.
unvarying; ; constant.
2.
Mathematics. (def 5e).
noun
3.
Mathematics. a quantity or expression that is constant throughout a certain range of conditions.
/ɪnˈvɛərɪənt/
noun
1.
(maths) an entity, quantity, etc, that is unaltered by a particular transformation of coordinates: a point in space, rather than its coordinates, is an invariant
adjective
2.
(maths) (of a relationship or a property of a function, configuration, or equation) unaltered by a particular transformation of coordinates
3.
a rare word for invariable
adj.

1851, from in- (1) “not” + variant.

programming
A rule, such as the ordering of an ordered list or heap, that applies throughout the life of a data structure or procedure. Each change to the data structure must maintain the correctness of the invariant.
(1996-03-12)

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