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location Ottawa, Canada
age 22
visits member for 1 year, 11 months
seen 13 hours ago

PhD student at University of Ottawa.


Dec
13
comment Conditions on $A,B$ that are inherited by $A+B$.
Hint: You can always write $1/n$ as $(n+1/n)+(-n)$.
Dec
13
comment Conditions on $A,B$ that are inherited by $A+B$.
It's hard to give a good hint without giving you the answer, but 3. is false.
Dec
13
comment Conditions on $A,B$ that are inherited by $A+B$.
Have you tried really proving all of those?
Dec
8
awarded  Caucus
Dec
8
comment Connected subsets of complex numbers
@Timbuc This is clear enough. What I mean is that it is important to explain why this specific decomposition implies that the set is disconnected. Any set with more than 2 elements may be written as the disjoint union of two nonempty sets.
Dec
8
answered A metric and discrete topology
Dec
8
comment Connected subsets of complex numbers
Nonempty closed subsets.
Dec
8
answered What does $[0, \infty]$ mean?
Dec
7
reviewed Close Why doesnt the sum of $\tan(1/n)$ converge?
Dec
7
reviewed Close What is the value of the expression $2x^2 + 3xy – 4y^2$ when $x = 2$ and $y = - 4$?
Dec
7
reviewed Close Closed-form expression for a sum of reciprocals of factorials
Dec
7
reviewed Close Solving $\sqrt{2}\times\sqrt{15}$
Dec
7
reviewed Approve How do I parameterize this figure?
Dec
6
answered How can the derivative of the Euclidean norm be exhibited without considering partial derivatives?
Dec
6
answered Joint spectrum of $\{a_1,…,a_n\}$
Dec
6
comment estimate of infinite norm by $(p,q)$ norms
What if $f$ is constant?
Dec
5
comment What does it mean to be absolutely integrable on $\mathbb{R}$ and what are the steps to show that something is absolutely integrable?
en.wikipedia.org/wiki/…
Dec
4
comment Proving translational invariance of Lebesgue integral
possible duplicate of How to prove that Lebesgue outer measure is translation invariant?
Dec
4
comment Question on Graphs?
"If $A$ is a subset of $V$, we denote by $N(A)$ the set of all vertices in $G$ that are adjacent to at least one vertex of $A$". Here we are simply defining $N(A)=\left\{x\in V:x\text{ is a neighbour of some }v\in A\right\}$. "So $N(A)=\bigcup_{v\in A}N(v)$". You can verify this last equality.
Dec
4
revised Question on Graphs?
edited, as asked