Poincaré conjecture

Poincaré conjecture

noun
Mathematics. the question of whether a compact, simply connected three-dimensional manifold is topologically equivalent to a three-dimensional sphere.

Origin:
named after J. H. Poincaré
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Poincaré conjecture is always a great word to know.
So is common divisor. Does it mean:
a number that is a submultiple of all the numbers of a given set
a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios
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