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tchappy ha's user avatar
tchappy ha
  • Member for 7 years, 8 months
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  • Tokyo
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23
Is a characteristic polynomial we consider in Linear Algebra a polynomial or a polynomial function?
Apr 19, 2020
9
Exercise 6.A.17 in "Linear Algebra Done Right 3rd Edition" by Sheldon Axler. I am worried if my solution is ok.
May 10, 2022
8
Is it true that if $\limsup\limits_{n \to \infty}\left|\frac{a_{n+1}}{a_n}\right| > 1$, then $\sum a_n$ diverges?
Sep 3, 2019
7
A simple question about the proof of theorem 3.42 in Walter Rudin's "Principles of Mathematical Analysis"
Jan 25, 2019
7
Is there a simple abelian group $G$ with infinite order?
Feb 1, 2019
7
Exercise 6.A.17 in "Linear Algebra Done Right 3rd Edition" by Sheldon Axler. I am worried if my solution is ok.
May 10, 2022
7
I heard that tensors are a generalization of scalars, vectors, and matrices. But tensors don't look like matrices at all.
Mar 10, 2020
6
A proof of Eisenstein's criterion and a related proposition in "Lectures on Algebra" by Teiji Takagi.
Jan 13, 2022
6
A group with 4 elements
Jan 10, 2019
6
What is the value of $\frac{1}{2}\int_B\int_B\frac{\rho(x,y,z)\rho(x',y',z')}{4\pi\epsilon_0\sqrt{(x-x')^2+(y-y')^2+(z-z')^2}}dxdydzdx'dy'dz'$?
Jul 23, 2023
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11
About shorthand notation for conditional pattern (Paul Wellin "Essentials of Programming in Mathematica")
8
I want an image like the following image. (Question about Plot)
6
Wolfram Language 12 says this absolutely convergent series does not converge. Is there any similar example?
6
Why didn't the author write "the rules we follow in dealing with sets are derived from them." instead of "sets derive from them"?