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gurghet
  • Member for 12 years, 10 months
  • Last seen more than a month ago
5 votes
2 answers
608 views

Non-natural transformation example

4 votes
2 answers
145 views

How to express the special property of a partial order?

4 votes
1 answer
8k views

Completing the squares for matrices

4 votes
3 answers
1k views

How to prove that if $a\equiv b \pmod{kn}$ then $a^k\equiv b^k \pmod{k^2n}$

3 votes
3 answers
132 views

What is the smallest number which begins with 7 and if you bring the 7 to the least significant position it becomes a third of the original number?

3 votes
1 answer
191 views

In a category, does the composition morphism need to exist?

2 votes
2 answers
100 views

A free category on the graph of flights. What idea is captured?

2 votes
1 answer
371 views

How to go from Fermat’s little theorem to Euler’s theorem thought Ivory’s demonstration?

2 votes
1 answer
2k views

Completion of the squares (actually of the quadratic forms)

1 vote
1 answer
134 views

Simplify non-linear but simple expression with max and min

1 vote
0 answers
196 views

Proof that isomorphisms are unique in any category

1 vote
1 answer
52 views

How to say that for any $x$ you have $\operatorname{id}_x : x \to x$?

1 vote
3 answers
248 views

What is the “on morphism” part of a free functor?

1 vote
2 answers
180 views

Existence of limits of set-valued functors gives me weird limits

1 vote
1 answer
52 views

When drawing a category, is it reasonable to imply composition?