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195 Answers

Votes Activity Newest
14
Homology of surface of genus $g$
Jun 20 '11 at 14:36
13
Why $\sqrt{-1 \times -1} \neq \sqrt{-1}^2$?
Jul 3 '11 at 10:55
10
Injective Holomorphic Functions that are not Conformal?
Aug 1 '11 at 16:38
8
What is the lowest positive integer multiple of $7$ that is also a power of $2$ (if one exists)?
Oct 22 '11 at 0:17
8
Power series without analytic continuation
Jun 22 '11 at 14:57
7
What results explicitly require second countability or the Hausdorff condition for a manifold?
Oct 20 '11 at 5:48
6
Determining whether a function is injective
Jul 16 '17 at 0:33
6
Jordan Measures, Open sets, Closed sets and Semi-closed sets
Sep 9 '11 at 19:42
6
Bijection between the plane and the surface of a sphere
Jun 19 '11 at 20:38
5
Is the intersection of two orthogonal planes a line, or the zero vector?
Aug 6 '17 at 22:07
4
Interesting counter-examples of relation between continuous and a.e. continuous function.
Apr 21 '15 at 3:31
4
Show that $R$ is closed but not sequentially compact.
Apr 9 '15 at 4:38
4
A compact Hausdorff space that is not metrizable
Oct 23 '11 at 2:08
4
Surface of genus $g$ does not retract to circle (Hatcher exercise)
Sep 2 '11 at 17:34
4
Prove that a sum of projections is a projection iff they are orthogonal, if the characteristic of the space is not $2$
Aug 31 '11 at 16:36
4
Is there a simulation for the Birthday Paradox?
Jul 31 '11 at 3:10
4
How to prove that $\mathbb{Q} \subset \mathbb{R}$ is not locally compact directly?
Jul 7 '11 at 4:16
3
How do kernels prove how a function fails to be injective
Jul 26 '17 at 22:50
3
Different ways to state the motivation of the definition of the product topology
Jul 23 '17 at 21:11
3
Continuity Vs IVT
Jul 17 '17 at 0:04
3
density of irrationals and rationals in reals implies rational and irrational sequences
Jul 15 '17 at 23:33
3
Find vectors when added up equal (1, 1, 1)
Apr 27 '15 at 4:22
3
Characterization of the $x$ such that $\sin(x)$ is rational?
Apr 12 '15 at 1:59
3
Find the square root of $404.11$.
Apr 7 '15 at 17:38
3
Let $E$ be the set of points for which $f(x)>g(x)$, where $f$ and $g$ are cont. funcs. Show $E$ is open.
Mar 29 '15 at 23:46
3
How to prove, that $e^x$ is uniformly continuous if $x$ is negative?
Jun 28 '14 at 23:52
3
Meaning of “a mapping factors over another”?
Aug 14 '11 at 13:39
3
Uniform convergence for sequences of functions
Nov 15 '11 at 1:04
3
Is $f(x+iy)=x^2-y^2 + i\sqrt{|xy|}$ complex differentiable?
Nov 11 '11 at 0:33
3
What term describes the property that of terms can be multiplied or divide in any order?
Nov 10 '11 at 0:28
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