Relating to or characterized by contragredience; transforming in an opposite or reciprocal manner under mathematical operations.
From 'contragredience' or directly from Latin 'contra-' + 'gredi' (to go, step). The adjective form of contragredience used in mathematical and physical contexts.
In linear algebra, vectors and their dual spaces are contragredient—they transform in opposite ways, which is why you need to know which type you're dealing with or your equations blow up.
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