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11h
comment Lazy mathematician: what are the real lengths in an Ideal Lambert quadrilateral?
I think, any proportion $a:b$ can be realized with an ideal point.
17h
answered Is this correspondence covariant or controvariant?
22h
comment Categories that differ in morphisms
Sorry, what do you mean by $C_1/C_2$? It isn't a kind of quotient here, is it?
23h
comment Lines in coordinate system of Hyperbolic Plane
Thank you, really nice pictures.
1d
comment Find the elementary divisors of a matrix given its characteristic and minimal polynomials
Ah, I thought if you already know the matrix, you can calculate it.
2d
answered Find the elementary divisors of a matrix given its characteristic and minimal polynomials
2d
revised Lines in coordinate system of Hyperbolic Plane
edited body
Jun
28
revised The ideal generated by the set $I \cup \{a\}$.
added 39 characters in body
Jun
28
answered The ideal generated by the set $I \cup \{a\}$.
Jun
28
revised Four questions about finite fields
added 56 characters in body
Jun
27
comment Representation of hyperbolas.
$\pmatrix{\cosh(\theta) & \sinh(\theta) \\ \sinh(\theta) & \cosh(\theta)}$ and the identity is: $\cosh^2-\sinh^2=1$.
Jun
27
answered Four questions about finite fields
Jun
27
comment Proof that $f$ is an isometry
Do you have any picture / intutition about the problem?
Jun
25
awarded  Nice Answer
Jun
25
answered To prove a sequence is Cauchy
Jun
23
answered Proof that $\sqrt{F!-1}$ is irrational
Jun
23
comment Proof that $\sqrt{F!-1}$ is irrational
Do we have any restriction what $F$ can be? Note that $F=2$ makes the expression $1$. For $F\ge 3$, your proof is valid.
Jun
23
revised How does one define a group with commutative diagrams?
deleted 11 characters in body
Jun
23
answered Is this subset of the plane path connected?
Jun
23
answered How does one define a group with commutative diagrams?