Stefan Kohl

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Name Stefan Kohl
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Location Germany
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15

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Prime race in 2 dimensions

feb 19 at 11:16 Stefan Kohl 2,600●2●15

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11
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Free subgroups of GL(2,Z)

jan 26 at 5:14 Mark Sapir 27.7k●2●57●118

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answers
242
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‘Almost-isomorphic’ groups

jan 18 at 11:39 Stefan Kohl 2,600●2●15

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23

Answers
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12
Small index subgroups of SL(3,Z)
11
The four squares theorem from the Gauss-Legendre three squares theorem
9
Rational points on a sphere in $\mathbb{R}^d$
9
The set of orders of elements in a group
8
Any other definition for algebraic number than the root of algebraic equation?
8
Collatz stopping-time and Poisson distribution, and connection to other problems?
7
Is it true that $p^2+1$ is square free if $p>7$ is a Mersenne prime
7
Does this sequence exhausts the prime numbers?
6
My output of a group and inverse-closed subset in MAGMA is no longer inverse-closed when entered as input to GAP.
6
Probability that randomly chosen integers from a restricted set of natural numbers are coprime
6
Notation of Wilson’s book “The finite simple groups”
5
The “interplay” between additive and multiplicative structure in a field
5
Are residually finite, perfect groups residually alternating?
4
wreath product and matrix presentation
2
Find root in finite field
2
Minimal period of arithmetic progressions occurring in sets of positive density.
1
submit the second part of a paper
1
Minimum sum among fixed length factors of a number
1
Reference for the set of orders of its elements
0
Conjugacy classes in PSL(3,q) and PSU(3,q)
0
Metacyclic groups in $AGL(4,3)$
0
Does this subgroup of “even braids” have a name?
0
The prime number $2$

 

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