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 May17 accepted Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots? May14 accepted How to show that $at^2+bt+c$ can be written as $\displaystyle $$a \left( t+\frac{b}{2a}\right) ^2-\frac{1}{4a}(b^2-4ac)$$$? May14 accepted What is $R(k,l)$? May6 accepted Is there a problem in assuming that a point is the same thing of a vector? Apr20 accepted Identify the subset of the plane composed by $R\cos \theta=5$ by means of polar coordinates $R,\theta$? Apr20 accepted Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$? 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?