Chessanator

Member for 6 years, 7 months
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category-theory

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Answers

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Score Activity Newest

13

What is the difference betwen equivalence and isomorphism of functors in categories.

May 28, 2019

12

Confused by proof of the irrationality of root 2: if $p^2$ is divisible by $2$, then so is $p$.

Aug 30, 2016

12

How to prove that there exist no functions $f,g:\Bbb{R}\to\Bbb{R}$ such that $f(g(x))=x^{2018}$ and $g(f(x))=x^{2019}$?

Jan 6, 2019

9

Difference between internal hom and exponential objects?

Apr 5, 2019

9

Show that $d(x,y) = \cos(x-y) + 3$ for $x \ne y$ is a metric.

Feb 25

Questions

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category-theory

102

Score

31

posts

abstract-algebra

56

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19

posts

proof-explanation

26

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10

posts

linear-algebra

25

Score

13

posts

real-analysis

24

Score

13

posts

Reputation

+15

Choice function for powerset of $S$ entails choice function for $S$

+10

Prove that every discrete subgroup of a topological group equipped with a metric is closed

+90

Show that $d(x,y) = \cos(x-y) + 3$ for $x \ne y$ is a metric.

+15

If $ \lambda \leq \kappa $ and $\nu \leq \mu$ then $\lambda^\nu \leq \kappa^\mu$

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