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Jun
29
comment Is it possible for a strategy game like paper, scissor rock to exist?
Define luck ...
Jun
28
comment (Is it a set?) Set of all months having more than 28 days.
@AsafKaragila: I am not so sure about your claim. Is the "set" of questions published in Math StackExchange not a set? A standard exercise for first year Algebra students is to compute the number of possible necklaces made of identical stones of different colors: this is done applying the Burnside formula to the dihedral group acting on the set of all necklaces. Does that mean that necklaces are mathematical objects?
Jun
27
revised (Is it a set?) Set of all months having more than 28 days.
deleted 39 characters in body
Jun
26
comment (Visual) Intuition: Division and complex fractions
Duplicate of math.stackexchange.com/questions/1339927/… ?
Jun
26
answered (Is it a set?) Set of all months having more than 28 days.
Jun
26
answered Why do we switch the denominator and numerator when we divide fractions?
May
25
comment Let $a,x \in \mathbb{Z}$ and $n \in \mathbb{N}$, suppose $ax \equiv 1 \mod n$. Prove $a$ is coprime to $n$.
I.e. $ax-nk=1$. Check en.wikipedia.org/wiki/B%C3%A9zout%27s_identity
May
12
comment Prove that the unit ball in $X$ is not compact
@MeesdeVries: Absolutely. Edited, thank you.
May
12
revised Prove that the unit ball in $X$ is not compact
added 15 characters in body
May
12
answered Prove that the unit ball in $X$ is not compact
May
11
comment Proving function is $C^k$
Note that when $n=1$, $f$ even means that $f(x)=f(\mid x\mid)$.
May
11
answered Multiplication modulo 10 in Cayley's Table
May
11
comment Multiplication modulo 10 in Cayley's Table
You are. This is the table of the multiplication between invertible integers mod 10
May
11
comment Multiplication modulo 10 in Cayley's Table
$3\cdot7=2\cdot10+1=1\bmod 10$. What do you mean by "9 is the limit"?
May
11
comment Continuity of $\frac{1}{|x|}$ at $x= 0$
@5xum: you have a point there, but then I'd still prefer saying "0 does not belong to any domain for a function defined by the rule $x\mapsto\frac1{\mid x\mid}$" ... just to make clear what your point is.
May
11
comment What automorphisms exist on the abelian group of positive rationals under multiplication?
What about a generic permutation of the prime numbers?
May
11
comment Continuity of $\frac{1}{|x|}$ at $x= 0$
I am not the downvoter, but I would edit your second sentence saying "is not" instead of "cannot" and "the function" instead of "a function".
Apr
8
reviewed Reopen How to study math to really understand it and have a healthy lifestyle with free time?
Apr
8
reviewed No Action Needed If $K$ and $H$ are subgroups of $G$ and $H \triangleleft K$ then $K \subseteq N(H)$.
Apr
8
reviewed Leave Open Show that $\mathbb{Z}$ and $2\mathbb{Z}$ are not isomorphic as rings.