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May
16
revised If X and Y are correlated random variables and Z is independent of X and Y, then are X+Z and Y independent?
fix obvious typo
May
16
suggested approved edit on If X and Y are correlated random variables and Z is independent of X and Y, then are X+Z and Y independent?
May
14
comment System of linear congruence, not relatively prime
Hint: use that you know the factorization of all the $m_i$ to write an equivalent system of equations where all the ${m_i}'$ are prime; check if it has solutions; and determine them using the CRT. $\;$ That can be made to work even if you do not known the factorizations of the $m_i$, by using $\gcd$. Complexity is is low, dominated by the final CRT step, I guess.
Jan
11
comment find the volume of the half-cone $\sqrt{x^{2}+y^{2}}<z<1,\ x>0$
@Axoren. Yes; thanks for noticing anyway. Fixed this, and the next issue about legibility, within the 5 minute allowance.
Jan
11
answered find the volume of the half-cone $\sqrt{x^{2}+y^{2}}<z<1,\ x>0$
Dec
22
revised System of linear diophantine modular inequalities
include a^j \not\equiv 1\pmod n in main statement
Dec
22
revised System of linear diophantine modular inequalities
use consistent terminology
Dec
22
asked System of linear diophantine modular inequalities
Dec
1
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.
Sep
24
awarded  Autobiographer
Jul
8
accepted Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$?
Jul
7
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.
Jul
4
revised Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$?
add a line break
Jul
4
asked Exists a binary primitive pentanomial of degree $n$, for every $n\ge5$?
Jul
2
awarded  Curious
Apr
12
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 $8/14$).
Apr
12
revised Enquiry to network flow
Final polish.
Apr
12
revised Enquiry to network flow
This flow is maximal
Apr
12
revised Enquiry to network flow
Polish
Apr
12
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 $8\le9$.