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Aug
24
answered Is there any way I can show $\theta(x)\theta^2(x)=x^{p-1}$, for $\theta\in \operatorname{Aut}(C_p)$ having order $3$
Aug
24
asked If points in a convex set $C$ escape to infinity roughly in direction $v$ then an infinite ray in that direction exists
Aug
24
answered An infinite dictionary: countably infinite or uncountably infinite?
Aug
24
comment Counterexample about representation of parametrized curves.
A curve $\gamma$ in $\mathbb R^2\subset \mathbb R^3$ is of course the intersection of $\mathbb R^2$ and $\gamma\times \mathbb R$ ...
Aug
24
answered Problem in showing that a norm is a norm on one space, but not on another.
Aug
24
comment Problem in showing that a norm is a norm on one space, but not on another.
Formulation mishap: Instead of "for all $x,y$ in $X$ and for all $\alpha\in\mathbb F$ there is a function $\|\cdot\|$ such that" you mean "The given function $\|\cdot\|$ on $X$ has the property that for all $x,y\in X$ and $\alpha\in \mathbb F$ ..."
Aug
23
answered Which is greater, $98^{99} $ or $ 99^{98}$?
Aug
23
answered If $\models \neg \phi$, then $\models \phi^\circ$, where $\phi^\circ$ is the “semi-dual” of $\phi$
Aug
23
revised Partitioning $\mathbb{R}^d$ with two convex sets
beginning a proof ...
Aug
23
awarded  Enlightened
Aug
23
awarded  Nice Answer
Aug
22
answered Showing $\bigcup_{k}\{(a_{1},…,a_{k}):a_{j}\in [0,1]\cap \mathbb{Q} ,\sum^{k} a_{j}=1\}$ is countable
Aug
22
comment what is the new order of the digits here ? Both the numbers $144$ and $441$ consists of the same digits?
@AsafKaragila I remember the 12 and 13 cases mentioned in an old (early 20th cetury) book with general world facts (history, geography, engineering, ...) in the math section (also when I was a teen)
Aug
22
comment Removable and non-removable discontinuity in one function
Just to mention a curious example in the vicinity of this question: $f\colon\mathbb Q\to \mathbb R$, $\frac ab\mapsto\frac1b$ is not continuous anywhere in its domain, but all points in $\mathbb R\setminus \mathbb Q$ are removable discontinuities.
Aug
22
comment A question about leap year
But the Gregorian calendar was not in effect in 1100, 1200, 1300, 1400, and 1500. Not to mention the 10 days skipped when it was introduced ...
Aug
22
answered A false conjecture by Goldbach
Aug
22
answered Proving: $2(n-1)<(n+1)\sqrt{n}$
Aug
22
answered Show there exists an integer $L<m\leq K$ such that $m/n$ is an upper bound but $(m-1)/n$ is not
Aug
22
comment Is there a proven formula for Pisano periods (Fibonacci numbers taken modulo $n$)?
Do you also need the result only for $k\equiv 1,2\pmod 4$? (After all $2^2\mid F_k(3)$ otherwise)
Aug
22
revised Is there a proven formula for Pisano periods (Fibonacci numbers taken modulo $n$)?
added 7 characters in body; edited title