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138 Answers

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103
Three coins are tossed. If one of them shows a tails, what is the probability that all three coins show tails?
Aug 21 '18 at 13:36
18
Why isn't this a well ordering of $\{A\subseteq\mathbb N\mid A\text{ is infinite}\}$?
Mar 16 '17 at 12:49
7
Can a sum of consecutive $n$th powers ever equal a power of two?
Sep 29 at 20:16
6
For which $n$ can the plane with $n$ points removed be equipped with a Lie group structure?
yesterday
6
$\mathbb K[s, t]/\langle s-t\rangle\simeq \mathbb K[t]$ as $\mathbb K$-algebras?
Apr 28 '15 at 12:12
6
Misleading expected value
Aug 24 '18 at 12:10
5
Does orthogonality of vectors depend on the chosen basis?
Mar 16 '17 at 13:57
5
Why doesn't the definition “$p$ is called 'prime' if $p\mid ab\implies p\mid a\,\text{ or }\,p\mid b$” hold up when we square numbers?
Jan 4 at 19:47
5
$\ker(β : V \otimes V → k)$ contains the subspace ${V}^{ \perp}\otimes V +V \otimes {V}^{\perp}$,
May 16 '18 at 13:43
5
Is the maximum degree of a planar graph 5?
Jul 15 '16 at 9:10
4
If $A$ is $4\times2$ and $B$ is $2\times4$, prove that $AB$ is not invertible
Oct 8 at 8:11
4
Permutation of array.
Nov 24 '18 at 20:31
4
Different ways to prove there are infinitely many primes?
Jan 18 '14 at 21:49
4
Solving P(TRUE) of finding counterpart pairs in 2 sets with constraints involving the Universal Genetic Code
Sep 6 '17 at 21:01
4
Mathematical operation to simulate logical OR with boolean values $\textsf{false} = 0,\ \textsf{true} = \mathbb{R}^*$
Apr 3 '17 at 9:04
3
Abelian subgroup of the unit quaternions
Nov 13 at 11:04
3
Let $G\cong H$. If $\exists g\in G$ s.t. $|g|=n$, then $\exists h\in H$ with $|h|=n$, and if each element of $G$ is finite, then each in $H$ is too.
Oct 30 at 0:00
3
Linear algebra: cross product property
Feb 20 at 10:52
3
Does the notation $(G/A)/B$ actually make sense?
Sep 26 '18 at 9:19
3
Does independence of each $Y, Z$ from $ X$ imply independence of $f(Y,Z)$ from $X$?
Jul 12 '18 at 21:35
3
Does local additivity imply local linearity?
Aug 23 '17 at 9:43
3
What is the error in this proof that the sum of the $n$-th roots of unity is $0$?
Mar 23 '17 at 13:07
3
About finite group generated by 2 elements
Mar 16 '17 at 14:49
3
Is 5 entries for an orthogonal matrix enough for reconstruction?
Dec 6 '16 at 10:49
3
Identify $\bigwedge^{N-1}V$ with $V$
Oct 19 '15 at 11:02
3
What is the minimal polynomial of $\bigotimes_{j=0}^{\infty}\mathbb{Q}(\zeta_{j})$?
Oct 16 '15 at 14:41
2
Why does the existence of events with probability $p^n, q^n$ contradict with the given statement?
Nov 13 at 10:15
2
Integrality of $A \otimes_k B$
Oct 31 at 10:47
2
Graph is $2$-edge-connected, when vertices has even degrees
Feb 24 at 21:58
2
Prime Number Distribution
Feb 10 at 22:48
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