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Show that the supremum of a family of continuous functions is lower semicontinuous.

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Zero-divisors in a unital $C^*$-algebra

...$endgroup$ – Anton Odina 24 mins ago - $begingroup$ Consider... ...$endgroup$ – Ryszard Szwarc 20 mins ago However, $A$ clearly... ...- Why doesn't Israel withdraw from the territories occupied during...

math.stackexchange.com > questions

Followup for proof of scalar multiplication of limits

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math.stackexchange.com > questions

Sum of critical graphs is critical

math.stackexchange.com > questions

Merge Extensions

...Overflow and across the Stack Exchange network - What motives... ...ECB vs CBC mode?... ...Function Integrability - Proposition 2.3.10 from Measury Theory by Donald Cohn... ...- When SOA graph isn't on the spec sheet?...

math.stackexchange.com > questions

Proving a vector space can be expressed as a linear combination

...glowing green thing that soldiers threw in the corridor of the White House... ...in ECB vs CBC mode?...

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confusion on notation and action

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mathoverflow.net > questions

Perron eigenvalue versus determinant for a class of circulant-like matrices

...The Perron eigenvalue $rho(A(z))$ of $A(z)$ is increasing with $...

mathoverflow.net > questions

Count N-tuples of commuting matrices over $F_q$ is given by polynomials with pattern $sum q^{A_i(N)} P_{i}(q) $, where $P_i$ - do not depend on $N$?...

...That goes back to Feit, Fine 1960, and variations of the problem... ...The polynomials above were computed with the help of Peter Taylor... ...What can be their number and general form for $k times k$ matrices...

mathoverflow.net > questions

Strict 2-functoriality of lax-slices of 2-categories