In mathematics, describing sets or sequences that share the same final or limiting behavior; moving toward the same end point or infinity together.
Modern mathematical term: co- (together/joint) + final (from Latin 'finalis' meaning end). Created in 20th-century mathematics to describe parallel asymptotic behavior.
Mathematicians love the prefix co- because it lets them describe objects that behave like mirror images or parallel versions—cofinal sequences in calculus help prove that different paths lead to the same infinite destination.
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