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Product space that is compact, but isn't sequentially compact

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If $\gcd(a,b)=1$, then there exists integers $x$ and $y$ such that $xa + yb = 1$

Awarded Feb 26, 2021 at 16:50

Is epsilon a useless symbol and when epsilon does belong into CFL?

Awarded May 28, 2019 at 14:30

Continuity of cartesian product of functions between topological spaces

Awarded Nov 20, 2018 at 17:50

What are open subsets of half-open interval of $\mathbb{R}$?

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Proof that product topology of subspace is same as induced product topology

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