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 Jan11 comment find the volume of the half-cone $\sqrt{x^{2}+y^{2}}0$ @Axoren. Yes; thanks for noticing anyway. Fixed this, and the next issue about legibility, within the 5 minute allowance. Jan11 answered find the volume of the half-cone $\sqrt{x^{2}+y^{2}}0$ Dec22 revised System of linear diophantine modular inequalities include a^j \not\equiv 1\pmod n in main statement Dec22 revised System of linear diophantine modular inequalities use consistent terminology Dec22 asked System of linear diophantine modular inequalities Dec1 comment Find all the integral solutions to $x^6-y^6+3x^4y-3y^4x+y^3+3x^2+3x+1=0$ A gremlin crept in this accepted answer's algebra! $x^6-y^6+3x^4y-3y^4x+3x^2+3x+1=0$ IS NOT equivalent to $(x+1)^3+(x^2+y)^3=(x+y^2)^3$. $\;$ Proof: $x=-1$, $y=-1$ is a solution of the later, but not of the former. $\;$ Other proof: mechanically expand $(x+1)^3+(x^2+y)^3-(x+y^2)^3$, giving $x^6-y^6+3x^4y-3y^4x+3x^2+3x+y^3+1$, with that pesky $y^3$ term. Sep24 awarded Autobiographer Jul8 accepted Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$? Jul7 comment Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$? Just to make it clear: that was me, about 4 years ago. I asked again because math.SE is perfect for this purpose, and there might have been progress/extra info. Jul4 revised Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$? add a line break Jul4 asked Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$? Jul2 awarded Curious Apr12 comment Enquiry to network flow @AlexyVincenzo: No with that constraint that $(2,5),(4,5),(6,5),(6,7)$ are saturated. Yes without that constraint (we can reduce everything in proportion $8/14$). Apr12 revised Enquiry to network flow Final polish. Apr12 revised Enquiry to network flow This flow is maximal Apr12 revised Enquiry to network flow Polish Apr12 comment Enquiry to network flow @MJD: We have $(5,7)\le9$, because that's a given. I used $(5,7)←8$ to mean than $(5,7)$ is assigned the value $8$ in the flow, and that matches $8\le9$. Apr12 revised Enquiry to network flow Polish Apr12 answered Enquiry to network flow Apr7 comment Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle. +1 for the idea of computing the area as ${d_1d_2\over2}\sin\theta$ and getting the details right!