Skip to main content
Emptymind's user avatar
Emptymind's user avatar
Emptymind's user avatar
Emptymind
  • Member for 7 years, 3 months
  • Last seen this week
15 votes
4 answers
5k views

Which of the following sets has the greatest cardinality?(Math subject GRE exam 0568 Q.61 )

8 votes
4 answers
2k views

Math subject GRE Exam 9768 Q.16

7 votes
2 answers
2k views

Proving Plancherel's identity.

6 votes
2 answers
2k views

Why infinite spheres and not just two?

5 votes
3 answers
470 views

Answering a question containing $\sqrt{1.5}$ without using calculator.

4 votes
1 answer
334 views

$L^{p} (\mathbb T)$ is complete.

4 votes
3 answers
244 views

Evaluating the integral $\int_{0}^{1}\frac{x^n}{1 + x^n}\,\mathrm dx$.

4 votes
3 answers
1k views

The jacobson radical of a ring $R$ contains no idempotents other than $0$. [closed]

4 votes
1 answer
632 views

Showing a certain ring is right Noetherian and not left Noetherian

4 votes
1 answer
173 views

Show that either $X$ or $Z$ is homotopy equivalent to a point.

3 votes
1 answer
549 views

Showing that a sequence of a cofibration is exact.

3 votes
0 answers
101 views

Find the homotopy fibre of the map $\pi$

3 votes
3 answers
130 views

How can I find the limit of the following sequence $\sin ^2 (\pi \sqrt{n^2 + n})$?

3 votes
1 answer
9k views

Why are there no continuous one-to-one functions from (0, 1) onto [0, 1]? [closed]

3 votes
4 answers
872 views

Sketching Parametric Graph of $\sin t$ against $\cos t$ in the Fourth Quadrant

3 votes
2 answers
241 views

Using the rational root test (subject Math GRE exam 9768 Q.31)

3 votes
1 answer
5k views

Uniqueness Of Fourier Series.

3 votes
3 answers
605 views

What is the first derivative and nth derivative of the following function $ y = \sqrt {2 +\sqrt {3 + \sqrt{x}}}$

3 votes
5 answers
9k views

Is the function $x|x|$ differentiable at $0$?

3 votes
2 answers
61 views

Why does $P_{17}$ being abelian imply that $P_{17} \leq N_G(P_3)$?

3 votes
1 answer
105 views

Understanding why collapsing $CX$ and $CY$ gives us $\sum (X \times Y)$?

3 votes
2 answers
218 views

Determining the grouplike elements of a Hopf algebra

3 votes
1 answer
166 views

Finding a chain map.

2 votes
1 answer
100 views

Corepresentable functor definition.

2 votes
3 answers
157 views

How did we know we can factor the following polynomial?

2 votes
1 answer
188 views

Understanding the solution of Exercise 4.1.32 in Tom Leinster "Basic Category Theory".

2 votes
1 answer
85 views

What is the meaning of $(\mu \otimes \mu) ({\rm id}\otimes \tau \otimes {\rm id})$?

2 votes
1 answer
36 views

Why showing that $\bar{xy} \in \bar{P}^{2}$ but that no power of $\bar{y}$ lies in $\bar{P}^2$ shows that it is a prime ideal?

2 votes
2 answers
71 views

why $N = 1 / \epsilon$?

2 votes
2 answers
559 views

Understanding the proof of a theorem using Hahn-Banach Theorem.

1
2 3 4 5
15