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 Apr12 accepted Prove that $(A,B)\sim(P,Q)$ and $(C,D)\sim (P,Q)\implies (A,B)\sim (C,D)$? Apr6 accepted Equations of the tangent lines of $y=x^4$ at the point $(2,0)$? Apr2 accepted How to show that $\frac{-1}{x^2}=0$ has no solutions? Apr2 accepted Are there two meanings to induction? Feb16 accepted $4$ judges must distribute grades from $1$ to $6$ for each participant. In how many ways one can score $22$ points? Feb9 accepted How to obtain the chromatic polynomial of $C_5$? Feb9 accepted What is the connection with $g=1+\frac{1}{g}$ and $G_n= 1+\frac{1}{G_{n-1}}$? Feb8 accepted Find the number of ways to obtain a total of $15$ points by throwing $4$ different dice? Feb7 accepted What is the need of exponential generating functions on combinatorial problems? Feb1 accepted What is $\langle I\rangle$ in this text? Jan28 accepted Confusion about Hajós construction? Jan27 accepted What is this binding function? Jan13 accepted Why the sequence generated by $x+e^x$ is $(1,x,\frac{x^2}{2!},\frac{x^3}{3!},\frac{x^4}{4!}\ldots)$? Jan7 accepted Why is it important to have the closed form of a generating function? Jan7 accepted Why the generating function of $a_r=r$ is $xf'(x)$ instead of $f'(x)$? Jan7 accepted How $(r-k){r \choose r-k}$ becomes $r{r-1 \choose r-k-1}$? Jan6 accepted Differentiating $1/(1-x)$ using the fact that $[x^n]'=nx^{n-1}$? Jan3 accepted Is there only one continuous-everywhere non-differentiable funtion? Jan2 accepted What's umbral calculus about? Dec31 accepted Does the maximum cut implies the minimum flow?