The quality of having equal extent or the same boundaries and scope as something else.
From co- (Latin: together) + extent (from Latin extentus, past participle of extendere, meaning stretched out). The term emerged in medieval logic and philosophy to describe objects or concepts that occupy the same logical or physical space.
When mathematicians talk about sets or regions that have coextent, they mean the territories perfectly overlap—not just partially, but completely. This concept is crucial in geometry and set theory for proving that different definitions actually describe the same thing.
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