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19h
revised Help understanding $T_1$ & $T_2$ spaces.
Some grammar, and one mathematical detail edited
19h
comment What interpretation of the Lie braket is this?
What is the definition of $\frac{\delta}{\delta x}$?
19h
answered Solving for a three dimensional vector.
19h
awarded  Mortarboard
21h
answered Show that $\mathbb{R}^m$ is not homeomorphic to $\mathbb{R}^n$
21h
comment Are these two definitions of basis equivalent?
@xhimi: The set $\beta$ belongs to $B$ which is by assumption a sub collection of $T$.
1d
answered Here are two fractions, $\frac{2}{3}$,$\frac{7}{8}$, which of these fractions are closer to $\frac{3}{4}$?
1d
revised A question about the contractibility of the Sierpinski space
edited tags
1d
comment The terminology for particular subsets of the power set of R
The way you defined $X$ it follows that $X=\emptyset$, because for any $x\in\mathbb{R}$ there exists $a\in\mathbb{R}$ with $x\geq a$.
1d
comment Suppose a continuous function $f:\mathbb{R} \rightarrow \mathbb{R}$ is nowhere monotone. Show that there exists a local minimum for each interval.
Definition of nowhere monotone?
1d
revised Determining if $\int f_n\to 0$ implies that $f_n\to 0$ in measure and $f_n(x)\to 0$ a.e.
edited tags
1d
revised Determining if $\int f_n\to 0$ implies that $f_n\to 0$ in measure and $f_n(x)\to 0$ a.e.
added 21 characters in body
1d
revised Determining if $\int f_n\to 0$ implies that $f_n\to 0$ in measure and $f_n(x)\to 0$ a.e.
added 15 characters in body
1d
revised Determining if $\int f_n\to 0$ implies that $f_n\to 0$ in measure and $f_n(x)\to 0$ a.e.
added 4 characters in body
1d
answered Determining if $\int f_n\to 0$ implies that $f_n\to 0$ in measure and $f_n(x)\to 0$ a.e.
May
22
revised How to find the image of the line $y=ax$ from upper half plane to poincare disk?
latex and tags
May
13
comment Let $(X, \mathfrak T)$ be a topological space and suppose that $A$ is a subset of $X$. Then 1. $Cl(A) = Cl(Int(A))$ 2. $Int(A) = Int(Cl(A))$
@AlyssaWallace: No problem. I'm glad you found it helpful.
May
13
comment Let $(X, \mathfrak T)$ be a topological space and suppose that $A$ is a subset of $X$. Then 1. $Cl(A) = Cl(Int(A))$ 2. $Int(A) = Int(Cl(A))$
@AlyssaWallace. Sure. You're welcome
May
13
comment Let $(X, \mathfrak T)$ be a topological space and suppose that $A$ is a subset of $X$. Then 1. $Cl(A) = Cl(Int(A))$ 2. $Int(A) = Int(Cl(A))$
@AlyssaWallace: The whole real line is an open set so its interior is the whole real line itself.
May
12
comment boundary of $\mathbb{Q}^n$ in $\mathbb{R}^n$
$\partial\mathbb{Q}$ is not $\mathbb{Q}$.