User Vincent - Mathematics Stack Exchange

104 votes

Accepted

Three coins are tossed. If one of them shows a tails, what is the probability that all three coins show tails?

answered Aug 21, 2018 at 13:36

23 votes

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Why isn't this a well ordering of $\{A\subseteq\mathbb N\mid A\text{ is infinite}\}$?

answered Mar 16, 2017 at 12:49

20 votes

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Example of a representation of $U(1)$ with $n>2$

answered Nov 10, 2020 at 22:24

16 votes

Name and layperson's explanation for an E8 group diagram.

answered Nov 2, 2020 at 13:34

12 votes

What is the representation of a Lie group intuitively?

answered Oct 9, 2021 at 20:19

10 votes

Are all isomorphisms between the Fano plane and its dual of order two?

answered Jan 18, 2022 at 9:21

10 votes

All vertices have degree 3 but graph is only 4-edge-colorable?

answered Dec 27, 2023 at 15:44

9 votes

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Beginner's question about representation weights in Lie algebras and their relation to eigenvalues

answered Dec 15, 2020 at 8:17

7 votes

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Adjoint representation of Sl(2,C)

answered Dec 12, 2019 at 22:12

7 votes

Does orthogonality of vectors depend on the chosen basis?

answered Mar 16, 2017 at 13:57

7 votes

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Misleading expected value

answered Aug 24, 2018 at 12:10

7 votes

Can a sum of consecutive $n$th powers ever equal a power of two?

answered Sep 29, 2019 at 20:16

7 votes

For which $n$ can the plane with $n$ points removed be equipped with a Lie group structure?

answered Nov 20, 2019 at 10:53

6 votes

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Abelian subgroup of the unit quaternions

answered Nov 13, 2019 at 11:04

6 votes

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$\mathbb K[s, t]/\langle s-t\rangle\simeq \mathbb K[t]$ as $\mathbb K$-algebras?

answered Apr 28, 2015 at 12:12

6 votes

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Is the maximum degree of a planar graph 5?

answered Jul 15, 2016 at 9:10

6 votes

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Probability and expected steps for two ants to meet on cube

answered Feb 5, 2020 at 13:38

6 votes

$G_2$ as the group of Isometries of a Projective Space

answered Nov 24, 2020 at 21:57

6 votes

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Triangular numbers divisible by $3$

answered Jun 20, 2020 at 22:39

5 votes

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Is the one-dimensional Lie algebra L=C semisimple?

answered Dec 6, 2019 at 14:00

5 votes

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For a connected, simply connected Lie group what does the Lie algebra tell me?

answered Jan 13, 2020 at 16:37

5 votes

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G2 weight and root lattce

answered Mar 2, 2022 at 10:42

5 votes

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Who's right regarding this proof of a property of the boundary of a union?

answered Oct 31, 2021 at 22:00

5 votes

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Transpose and adjoint of a linear operator

answered Jun 15, 2017 at 9:11

5 votes

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If $A$ is $4\times2$ and $B$ is $2\times4$, prove that $AB$ is not invertible

answered Oct 8, 2019 at 8:11

5 votes

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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?

answered Jan 4, 2019 at 19:47

5 votes

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$\ker(β : V \otimes V → k)$ contains the subspace ${V}^{ \perp}\otimes V +V \otimes {V}^{\perp}$,

answered May 16, 2018 at 13:43

4 votes

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Solving P(TRUE) of finding counterpart pairs in 2 sets with constraints involving the Universal Genetic Code

answered Sep 6, 2017 at 21:01

4 votes

Permutation of array.

answered Nov 24, 2018 at 20:31

4 votes

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Mathematical operation to simulate logical OR with boolean values $\textsf{false} = 0,\ \textsf{true} = \mathbb{R}^*$

answered Apr 3, 2017 at 9:04

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280 Answers

Three coins are tossed. If one of them shows a tails, what is the probability that all three coins show tails?

Why isn't this a well ordering of $\{A\subseteq\mathbb N\mid A\text{ is infinite}\}$?

Example of a representation of $U(1)$ with $n>2$

Name and layperson's explanation for an E8 group diagram.

What is the representation of a Lie group intuitively?

Are all isomorphisms between the Fano plane and its dual of order two?

All vertices have degree 3 but graph is only 4-edge-colorable?

Beginner's question about representation weights in Lie algebras and their relation to eigenvalues

Adjoint representation of Sl(2,C)

Does orthogonality of vectors depend on the chosen basis?

Misleading expected value

Can a sum of consecutive $n$th powers ever equal a power of two?

For which $n$ can the plane with $n$ points removed be equipped with a Lie group structure?

Abelian subgroup of the unit quaternions

$\mathbb K[s, t]/\langle s-t\rangle\simeq \mathbb K[t]$ as $\mathbb K$-algebras?

Is the maximum degree of a planar graph 5?

Probability and expected steps for two ants to meet on cube

$G_2$ as the group of Isometries of a Projective Space

Triangular numbers divisible by $3$

Is the one-dimensional Lie algebra L=C semisimple?

For a connected, simply connected Lie group what does the Lie algebra tell me?

G2 weight and root lattce

Who's right regarding this proof of a property of the boundary of a union?

Transpose and adjoint of a linear operator

If $A$ is $4\times2$ and $B$ is $2\times4$, prove that $AB$ is not invertible

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?

$\ker(β : V \otimes V → k)$ contains the subspace ${V}^{ \perp}\otimes V +V \otimes {V}^{\perp}$,

Solving P(TRUE) of finding counterpart pairs in 2 sets with constraints involving the Universal Genetic Code

Permutation of array.

Mathematical operation to simulate logical OR with boolean values $\textsf{false} = 0,\ \textsf{true} = \mathbb{R}^*$