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Aug
19
comment Is division allowed in rings and fields?
You can also see here Division ring
Aug
5
comment Linear Algebra-Intersections and Distances in R3 and R2.
What are your answers?
Aug
5
comment Solve for $x$ in the equation
Hint: Your equation is equivalent to $\dfrac{5^x}{3^x}=2$.
Aug
5
comment What does “single set” mean in this context?
You have a set $X$. You call it $X_1$ if you consider it with the topology $\tau_1$, and $X_2$ with $\tau_2$.
Aug
5
comment Integrating $\frac 1 {\sqrt{x^2 - a^2}}$
Let $x=a\sec(t)$.
Jul
29
comment How do mathematicians know what is known?
math.stackexchange.com/questions/40811/…
Jul
27
comment $f$ is twice differentiable, $f + 2 f^{'} + f^{''} \geq 0$ , prove the following
@Nishant everywhere... where? The domain of $f$ is $[0,1]$.
Jul
12
comment Munkres Topology Exercise 2.q
Yeah, that is true. You're welcome. :)
Jul
12
comment Munkres Topology Exercise 2.q
@Code-Guru Yes. Thanks.
Jul
12
comment Munkres Topology Exercise 2.q
$(a,b)\not\in C\times D \implies a\not\in A\mbox{ or }b\not\in D$.
Jul
5
comment Multivariable limit with parameter
Kind of. You can see it as an application of the squeeze theorem.
Jul
5
comment Multivariable limit with parameter
$$\left\| \dfrac{yx^n}{x^6+y^2}\right\|\le \left\| \dfrac{yx^n}{x^6}\right\|=\left\| yx^{n-6}\right\|,$$ so for $n\ge 6$ the limit is equal to $0$. You need to check $n=4,5$.
Jul
5
comment Simultaneous log equations
It means that $\log(a)=\log(b)$ implies $a=b$.
Jul
5
comment Simultaneous log equations
$\log$ is injective.
Jul
4
comment Condensation point of Cantor set
@JonasMeyer Oh, sorry, I was thinking about accumulation points.
Jul
4
comment Condensation point of Cantor set
You can consider the sequence $\left( \dfrac{1}{3^n} \right)_{n\in\Bbb N}$ and $0$.
Jul
1
answered Some questions about the proof of the General Linear Group being a manifold.
Jul
1
revised Functions that are defined by the equation
added text from picture
Jul
1
suggested suggested edit on Functions that are defined by the equation
Jun
29
revised Finite Cyclic group isomorphic to C
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