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invariant - 4 dictionary results

in⋅var⋅i⋅ant

[in-vair-ee-uhnt]
–adjective
1. unvarying; invariable; constant.
2. Mathematics. normal (def. 5e).
–noun
3. Mathematics. a quantity or expression that is constant throughout a certain range of conditions.

Origin:
1850–55; in- 3 + variant


in⋅var⋅i⋅ant⋅ly, adverb
in·var·i·ant   (ĭn-vâr'ē-ənt)   
adj.  
  1. Not varying; constant.
  2. Mathematics Unaffected by a designated operation, as a transformation of coordinates.
n.  An invariant quantity, function, configuration, or system.
in·var'i·ance n.

Invariant

In*va"ri*ant\, n. (Math.) An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations. --J. J. Sylvester.

invariant 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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