Jack M
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 23h reviewed Approve Orthogonal circles Apr3 reviewed Reject Why only the numerator is derived? Jan27 reviewed Reject If $|B\times A| = 15$ ,evaluate: $|A\cap B|$ Jan10 reviewed Reject Give a direct proof of the fact that $a^2-5a+6$ is even for any $a \in \mathbb Z$ Nov18 reviewed Edit If the number $x$ is algebraic, then $x^2$ is also algebraic Oct4 reviewed Approve Prove all multiples of $U$ contain all the digits $0$ to $9$ Aug14 reviewed Approve How would I find $n^n \pmod 5$? Jun26 reviewed No Action Needed Compute the first six terms of the following sequences (start with n = 1): Jun20 reviewed Approve Derivative of rational function help. Jun15 reviewed Approve Group theoretical characterization of $\mathbb Q$ and $\mathbb Q^\star$ May20 reviewed Approve Understandng euclids theorem May20 reviewed Edit prove that $2^{15} - 2^3$ divides $a^{15} - a^3$ May18 reviewed Leave Open Which method i must use to this series (diverge or not) May8 reviewed Approve Would like help with a zero as constant Apr10 reviewed Edit mathematical biology1 Apr4 reviewed Approve Is $n^2+1$ always a product of Pythagorean primes? Apr4 reviewed Leave Open Pythagorean Proof! Apr4 reviewed Close How to find this limit Mar1 reviewed Approve I need to understand $t=\cos(x) \implies x=\arccos(t)$ Feb23 reviewed Approve Problem with a simple exercise