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Dec
11
reviewed Leave Open How and how much do the notations and diagrams influence our understanding of mathematical concepts?
Dec
10
reviewed Leave Closed Have there been any new developments in the Firoozbakht conjecture?
Dec
10
awarded  Nice Answer
Dec
10
reviewed Close Probability of guessing the colors of a deck of cards correctly
Dec
10
revised How to calculate the infinite sum of this double series?
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Dec
10
answered How to calculate the infinite sum of this double series?
Dec
8
reviewed Leave Open How to calculate the infinite sum of this double series?
Dec
6
reviewed Leave Closed The resolution of which conjecture/problem would advance Mathematics the most?
Dec
6
awarded  Enlightened
Dec
6
awarded  Nice Answer
Dec
6
revised Which natural numbers are a square minus a sum of two squares?
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Dec
5
revised Which natural numbers are a square minus a sum of two squares?
added 219 characters in body
Dec
5
answered Which natural numbers are a square minus a sum of two squares?
Dec
5
comment Which natural numbers are a square minus a sum of two squares?
If $n>3$ is $3\pmod 4$ then it is easy to check that there is a representation of the desired form (indeed with $c=1$). So these numbers (and squares times these numbers) must be excluded from the idoneal list. For other integers, the problem seems pretty much equivalent to the ``one class per genus"/idoneal numbers problem.
Dec
5
comment Which natural numbers are a square minus a sum of two squares?
Do you allow $b$ or $c$ to be zero?
Dec
5
reviewed Close What would be nice open problem in evolutionary game theory ?
Dec
4
reviewed Close minimizing an integral over integer-coefficient polynomials $\displaystyle \inf_{f \in \mathbb{Z}[x]} \int_a^b f(x)^2 \, dx $
Dec
4
reviewed Close Upper and lower limits
Dec
3
reviewed No Action Needed (Eichler-Shimura Isomorphism) Proving c(f) is not a boundary
Dec
2
reviewed Leave Open Are there Zoll pancakes?