User kobi - Mathematics Stack Exchange

kobi

Member for 7 years, 11 months
Last seen more than a week ago

7 Answers

Score Activity Newest

6 votes

Cross product in complex vector spaces

linear-algebra complex-numbers complex-geometry cross-product

answered Mar 13, 2015 at 8:44

3 votes

Accepted

The Weyl group of $E_6$ acting on embedded circles

lie-groups group-actions

answered Aug 14, 2014 at 6:43

2 votes

Quaternion Rotation

3d rotations quaternions

answered Jul 22, 2016 at 13:40

1 vote

$GL_n(\mathbb F_q)$ has an element of order $q^n-1$

linear-algebra abstract-algebra finite-fields linear-groups

answered Jan 7, 2019 at 9:06

1 vote

Possible orders of trace k elements in $SL_2(\mathbb F_q)$

finite-groups finite-fields gap

answered Jan 11, 2019 at 8:00

0 votes

Prove that $\gcd(P, P')$ is an irreducible polynomial over $\Bbb R.$

linear-algebra derivatives polynomials euclidean-algorithm

answered Mar 29, 2019 at 11:35

0 votes

Angle between two planes in four dimensions

linear-algebra

answered Jul 22, 2016 at 12:43