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Sep
24
awarded  Autobiographer
May
31
awarded  Editor
May
31
revised Introduction to Vectors
Typo correction and clarification
May
31
suggested approved edit on Introduction to Vectors
May
23
comment Determine sphere radius and center in $\mathbb R^3$
Compare the problem you wrote with what I wrote symbol for symbol. If you replace r with a in mine you get yours. Make sense?
May
23
answered Determine sphere radius and center in $\mathbb R^3$
May
23
answered Prove that if $n=ab$, $a$ and $b$ are positive integers, then $a \leq \sqrt{n}$ or $b \leq \sqrt{n}$
May
22
awarded  Teacher
May
22
answered $\gcd(a,\operatorname{lcm}(b,c))=\operatorname{lcm}(\gcd(a,b),\gcd(a,c))$