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White Crow
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"If you wish to upset the law that all crows are black, you mustn't seek to show that no crows are; it is enough if you prove one single crow to be white."

– William James

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View all questions and answers
answer
10
Show that $f(x)=\cos(x)$ is Lipschitz continuous function.
Mar 5, 2019
answer
6
Differentiability of matrix square root operator
Nov 4, 2018
question
2
Under certain conditions, is it true that $\overline{Z \cap U} = Z$?
Mar 10, 2019
question
2
Example of a pushforward sheaf
Jun 10, 2019
question
2
Find the radius of convergence of the complex power series.
Jan 15, 2020
question
2
Show that the extension $\mathbb{R}(X) \supseteq \mathbb{R}\left(X^2+\frac{1}{X^2}\right)$ is Galois and find its Galois group.
Sep 22, 2021
answer
2
How can I transform this expression into the desired one?
Oct 21, 2018
answer
2
Linear independence of basis vectors
Nov 4, 2018
question
1
How to show $f: \mathbb{R}^2 \rightarrow \mathbb{R}$ given by $f(x,y)=x^3$ is an open map?
Oct 21, 2018
question
1
Show $f$ is a local diffeomorphism of class $C^k$.
Oct 29, 2018