Apparently, this user prefers to keep an air of mystery about them.
3 If $a,b,c,d$ be the roots of the biquadratic $x^4-x^3+2x^2+x+1=0$ then show that $(a^3+1)(b^3+1)(c^3+1) (d^3+1)=16$ Nov 21 '12
2 Determinant of a $4\times4$ invertible matrix Nov 19 '12
2 Using the Comparison Test, prove that the infinite series of $(n^2+1)/(n^3+2)$ converges/diverges. Nov 19 '12
1 Is saying that $2^n+1<2^n\cdot2$ for $n \in \mathbb N$ is true enough to end the proof? Nov 28 '12
1 Calculating Probabilities Nov 19 '12