User my2cents

8 votes

1 answer

638 views

Geometric intuition for adjoint

asked Dec 14, 2021 at 19:06

4 votes

2 answers

114 views

Is there any way to refer to a function $f$, without defining $f$? [closed]

asked Aug 12, 2021 at 19:56

2 votes

1 answer

83 views

Are unitarily and orthogonally diagonalizable equivalent over the complex numbers $\mathbb{C}$?

asked Dec 14, 2021 at 1:44

2 votes

1 answer

137 views

Can we define $\ln(x)$ as a solution of $\frac{d}{dx}(f(x))=\frac{1}{x}$?

asked Sep 4, 2020 at 19:21

2 votes

0 answers

109 views

Can we combine set notation and interval notation?

asked Sep 6, 2020 at 0:34

2 votes

1 answer

214 views

What's so special about the number 24 in the definition of the Ramanujan tau function?

asked Dec 3, 2022 at 23:03

1 vote

2 answers

314 views

Help proving $T$ and $S^{-1}TS$ have the same eigenvalues

asked Aug 8, 2021 at 5:58

1 vote

0 answers

131 views

How to prove that the vector space of all $n \times n$ matrices is the direct sum of the vector spaces of symmetric and skew-symmetric matrices?

asked Aug 31, 2021 at 22:30

0 votes

1 answer

311 views

How to prove that if $T$ is diagonalizable and $T^3=T^2$, $T^2=T$? [duplicate]

asked Aug 13, 2021 at 18:55

0 votes

0 answers

39 views

How to prove or disprove that all linear maps from $\mathbb{R}^3$ to $\mathbb{R}^3$ have a real eigenvalue? [duplicate]

asked Aug 8, 2021 at 18:41

0 votes

0 answers

49 views

Exercise 4.30 of Eisenbud: how to connect a maximal ideal in a localization with the original ring's property of being finitely generated?

asked Mar 11 at 23:10

0 votes

0 answers

34 views

Why isn't natural density countably additive on the algebra generated by periodic sets?

asked Sep 20 at 6:30

-1 votes

0 answers

30 views

Extending proof that $\sigma$-algebras cannot be countable to proof that $\sigma$-algebras are finite or have cardinality $\ge |2^{\mathbb{N}}|$

asked Sep 20 at 5:38

Stack Exchange Network

13 Questions

Geometric intuition for adjoint

Is there any way to refer to a function $f$, without defining $f$? [closed]

Are unitarily and orthogonally diagonalizable equivalent over the complex numbers $\mathbb{C}$?

Can we define $\ln(x)$ as a solution of $\frac{d}{dx}(f(x))=\frac{1}{x}$?

Can we combine set notation and interval notation?

What's so special about the number 24 in the definition of the Ramanujan tau function?

Help proving $T$ and $S^{-1}TS$ have the same eigenvalues

How to prove that the vector space of all $n \times n$ matrices is the direct sum of the vector spaces of symmetric and skew-symmetric matrices?

How to prove that if $T$ is diagonalizable and $T^3=T^2$, $T^2=T$? [duplicate]

How to prove or disprove that all linear maps from $\mathbb{R}^3$ to $\mathbb{R}^3$ have a real eigenvalue? [duplicate]

Exercise 4.30 of Eisenbud: how to connect a maximal ideal in a localization with the original ring's property of being finitely generated?

Why isn't natural density countably additive on the algebra generated by periodic sets?

Extending proof that $\sigma$-algebras cannot be countable to proof that $\sigma$-algebras are finite or have cardinality $\ge |2^{\mathbb{N}}|$