Englishfor English speakers
invariance
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noun
the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it
the invariance of the configuration under translation
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noun
(= invariability)
the quality of being resistant to variation
breakdown
Noun
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A breakdown is when something has failed, usually having to do with a machine of some sort.
The car they were driving had a breakdown when the engine stopped working.
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A brekadown is when someones' state of mind has fallen apart or lapsed.