Easy way to see that $(x^2 + 5x + 4)(x^2 + 5x + 6) - 48 = (x^2 + 5x + 12)(x^2 + 5x

Limit of $a_{n+1} = a_{n}(1+1/n^2)$

Proving identity in infinite series

Can an isomorphism of subgroups of a finite group always be extended to an automorphism on the group?

Is this projection matrix?

Finding the limit of $a_n = \frac{n+1}{2^{n+1}}\left(\frac{2}{1}+\frac{2^2}{2}+...+\frac{2^{n}}{n}\right)$

If $f(x+1/n)$ converges to a continuous function $f(x)$ uniformly on $\mathbb{R}$, is $f(x)$ necessarily uniformly continuous?

Can the map sending a presentation to its group be considered as a functor?

What is the smallest group containing all finite cyclic groups?

Is there a graphical proof that $9n+1$ is triangular if $n$ is?

Proof: not a perfect square

If polynomial $P(x)$ has integer coefficients and at least three integer roots, then $P(x)+5^m$ has no more than one integer root for $m\geq 1$

Values of $a$ such that $x^5-x-a$ has quadratic factor

Easy way to see that $(x^2 + 5x + 4)(x^2 + 5x + 6) - 48 = (x^2 + 5x + 12)(x^2 + 5x - 2)$?