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Top Questions
50 votes

Can I make Ctrl+Alt+Del go directly into the task manager in Windows 7?

windows-7 task-manager ctrl-alt-delete asked Dec 5 '12 at 4:56
superuser.com

19 votes

How many triangles

combinatorics puzzle recreational-mathematics asked Sep 28 '12 at 8:43
math.stackexchange.com

19 votes

How to convert CharSequence to String in JAVA?

java string charsequence asked Oct 10 '11 at 0:35
stackoverflow.com

16 votes

Calculating $\lim_{n\to\infty}\sqrt{n}\sin(\sin…(\sin(x)..)$

real-analysis limit numerical-methods asked Jan 12 at 0:46
math.stackexchange.com

16 votes

Converting String to long in Java

java asked Oct 7 '11 at 22:07
stackoverflow.com

12 votes

Proving that every isometry of $\mathbb{R}^n$ is of the form of a composition of at most $n+1$ reflections

geometry asked Apr 28 '12 at 12:11
math.stackexchange.com

10 votes

Does $\mu^{*}(E)=1$ imply $\mu^{*}(E^{c})=0$ when $\mu$ is an outer measure and the measure of the space is $1$

real-analysis asked Dec 16 '12 at 23:21
math.stackexchange.com

9 votes

Proving $\sqrt{a+\sqrt{b}}=\sqrt{m}+\sqrt{n}\iff a^{2}-b$ is a square

abstract-algebra field-theory asked Sep 9 '12 at 19:58
math.stackexchange.com

8 votes

How does a branch cut define a branch?

complex-analysis asked Nov 27 '12 at 9:57
math.stackexchange.com

6 votes

$K/E$, $E/F$ are separable field extensions $\implies$ $K/F $ is separable

abstract-algebra field-theory galois-theory asked Jun 6 '12 at 17:22
math.stackexchange.com

1 2 3 next

Top Answers
26
If $A$ is singular, is $A^3+A^2+A$ singular?
math.stackexchange.com

15
Linear independence of $\sin(x)$ and $\cos(x)$
math.stackexchange.com

11
Solving $5^n > 4,000,000$ without a calculator
math.stackexchange.com

10
For $n∈ N$, determine the real part of $(1 + i\sqrt{3})^{n}$
math.stackexchange.com

9
Prove that $AB=BA=0$ for two idempotent matrices.
math.stackexchange.com

8
If $[L : K ] = n$, then for every irreducible polynomial $f$ is $\operatorname{deg}(f) \le n$.
math.stackexchange.com

7
Appropriate Notation: $\equiv$ versus $:=$
math.stackexchange.com

7
Shortest paths from $s$ by weight which contain even number of edges
math.stackexchange.com

7
Last four digits of $S=9+9^2+9^3+\ldots+9^{400}$
math.stackexchange.com

6
How to show $\mathbb{Q}(\alpha^{4})=\mathbb{Q}(\alpha)$?
math.stackexchange.com

6
Prove that $A=\left(\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right)$ is not invertible
math.stackexchange.com

5
If $I = \langle 2\rangle$, why is $I[x]$ not a maximal ideal of $\mathbb Z[x]$, even though $I$ is a maximal ideal of $\mathbb Z$?
math.stackexchange.com

5
An eigen value problem
math.stackexchange.com

5
Reducing a fraction with the denominator as a root.
math.stackexchange.com

5
Is the group direct sum operation itself a group operation?
math.stackexchange.com

5
Abelian rings question
math.stackexchange.com

5
Number of solutions for sixth order equation
math.stackexchange.com


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