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 Apr19 asked Why can't we have an $y$ such that $xy\equiv 1\; (mod\; n)$ when $n$ is not prime? Apr19 awarded Good Question Apr14 comment Show that if $a,k\in \mathbb{Z}$ with $0\leq k \leq a$, then $\binom ak=\frac{a!}{k!(a-k)!}=\binom {a}{a-k}$. Excuse me, It's not really clear why I should do that. Apr14 asked Show that if $a,k\in \mathbb{Z}$ with $0\leq k \leq a$, then $\binom ak=\frac{a!}{k!(a-k)!}=\binom {a}{a-k}$. Apr14 comment Which triangular numbers are also squares? What I still don't understand is why that is the condition. Apr14 comment Which triangular numbers are also squares? @AndréNicolas Yes. But does this applies with generality? Apr13 comment Which triangular numbers are also squares? @AndréNicolas Is there a master secret to avoid fractions? I've escaped school, then I don't remember most basic stuff such as this (Presuming it is basic). Apr13 comment Which triangular numbers are also squares? @AndréNicolas I've done the following: $n^2+n+\frac{1}{4}=m^2+\frac{1}{4}$. Apr13 asked Which triangular numbers are also squares? Apr13 revised Spelling has deteriorated by the year of 2075, how many spellings are possible? added 15 characters in body Apr13 comment Spelling has deteriorated by the year of 2075, how many spellings are possible? @OlivierBégassat I was thinking about it. Now that you gave the answer, I feel rleiifed. Thanks. Apr12 awarded Nice Question Apr12 asked Is there a simple algorithm for exponentiating large numbers to large powers? Apr12 revised Does writing a bachelor thesis make sense? added 2 characters in body Apr12 answered Does writing a bachelor thesis make sense? Apr12 comment Are there surfaces with more than two sides? @AlexBecker You can point me to it anyway. I'm studying on a math major, someday I'll understand it. Apr12 asked Are there surfaces with more than two sides? Apr11 accepted Why $¬¬\bot \not\in PROP$? Apr10 comment Why $¬¬\bot \not\in PROP$? Yes. Thanks guys! Apr10 comment Why $¬¬\bot \not\in PROP$? @AndreasBlass Why each $¬$ needs a pair or parentheses?