User Bernhard Boehmler

11 votes

2 answers

2k views

Does the curvature determine the metric?

differential-geometry riemannian-geometry

asked Jun 23, 2012 at 22:14

8 votes

5 answers

2k views

Proving irreducibility of $x^6-72$

abstract-algebra irreducible-polynomials

asked Jul 14, 2013 at 20:10

7 votes

0 answers

154 views

Can MAGMA compute Auslander-Reiten sequences in group algebras?

group-theory finite-groups representation-theory magma-cas

asked Aug 9, 2019 at 1:51

5 votes

1 answer

484 views

Special formula for the permanent of the sum of two matrices

linear-algebra abstract-algebra matrices algebra-precalculus permanent

asked Jan 22, 2018 at 21:15

5 votes

1 answer

95 views

Is there an OpenSource CAS compatible with GAP where relatively fast computation of Hom$_{kG}(M,N)$ over "large" finite fields is possible?

group-theory algorithms modules gap programming

asked Nov 8, 2021 at 6:06

5 votes

1 answer

137 views

How to construct submodules with GAP / MeatAxe?

group-theory algorithms modules representation-theory gap

asked Nov 30, 2021 at 17:42

4 votes

0 answers

104 views

MAGMA-question concerning the transformation of a $kG$-module $M$ into a right ideal of the group algebra

group-theory modules representation-theory magma-cas

asked Oct 1, 2020 at 22:27

4 votes

0 answers

547 views

Does the curvature determine the metric for all surfaces

differential-geometry riemannian-geometry

asked Jun 24, 2012 at 16:31

4 votes

1 answer

182 views

Question concerning the GAP package qpa (find all ideals with a certain property)

abstract-algebra computer-science gap

asked Aug 18, 2014 at 13:10

4 votes

1 answer

310 views

Non-central conjugacy class sizes in non-abelian groups of odd order

group-theory

asked Oct 30, 2011 at 16:10

3 votes

0 answers

669 views

Correspondence between summands of a module and primitive idempotents of the endomorphism ring of the module

abstract-algebra representation-theory

asked Jul 20, 2012 at 8:34

3 votes

0 answers

61 views

Can MAGMA compute pullbacks of $kG$-modules?

group-theory reference-request representation-theory computational-mathematics magma-cas

asked Apr 7, 2020 at 1:50

3 votes

1 answer

151 views

How to distinguish two "almost isomorphic" groups

abstract-algebra group-theory finite-groups group-isomorphism computational-mathematics

asked Mar 9, 2020 at 14:05

3 votes

1 answer

113 views

How to construct an explicit isomorphism between two special endomorphism rings

abstract-algebra representation-theory homological-algebra

asked Jun 9, 2015 at 12:11

3 votes

0 answers

70 views

How to find the irreducible constituents of a Brauer character with MAGMA?

group-theory finite-groups magma-cas

asked May 6, 2019 at 19:05

3 votes

1 answer

51 views

How to extend scalars of a MeatAxe $kG$-module $M$ given in GAP?

group-theory reference-request field-theory finite-fields gap

asked Feb 15, 2021 at 22:54

2 votes

1 answer

62 views

Given an indecomposable $kG$-module $M$, can MAGMA compute a minimal projective cover of $M$?

group-theory representation-theory magma-cas

asked Aug 4, 2019 at 20:07

2 votes

1 answer

115 views

How to do inflation of $k(G/N)$-modules with MAGMA?

group-theory finite-groups magma-cas

asked Nov 20, 2018 at 20:10

2 votes

1 answer

95 views

MAGMA-question concerning the multiplicity of indecomposable $kG$-modules in a decomposable $kG$-module

group-theory modules representation-theory magma-cas

asked Feb 11, 2020 at 15:30

2 votes

0 answers

46 views

Does MAGMA automatically identify $G$ and $G^\text{op}$?

abstract-algebra group-theory finite-groups representation-theory magma-cas

asked Apr 25, 2020 at 19:53

2 votes

2 answers

96 views

Compute the values of two infinite products whose factors are the same

real-analysis number-theory limits infinite-product

asked Apr 26, 2015 at 19:25

2 votes

1 answer

177 views

Question about matrix multiplication

group-theory

asked Mar 16, 2012 at 19:17

2 votes

1 answer

94 views

Differentiable map conserving geodetic lines which is no isometry

differential-geometry riemannian-geometry

asked Jun 30, 2012 at 18:31

1 vote

1 answer

341 views

Is there a computer programm or CAS (maybe GAP?) that can calculate with projective (indecomposable) A-modules (A is a finite dimensional k-algebra)?

computer-science computational-mathematics computer-algebra-systems gap sagemath

asked Aug 9, 2013 at 0:00

1 vote

1 answer

59 views

Lemma about f.g. abelian groups endowed with a certain bilinear form

group-theory

asked Apr 7, 2012 at 10:35

1 vote

1 answer

622 views

How to stop a calculation in GAP without closing GAP?

group-theory gap

asked Dec 11, 2014 at 15:58

1 vote

1 answer

77 views

Interchanging summands among infinitely many infinite series

sequences-and-series complex-analysis number-theory analytic-number-theory infinite-product

asked Mar 13, 2015 at 16:02

1 vote

1 answer

34 views

How to prove a certain inequality for a complex valued function using its derivative?

real-analysis complex-analysis inequality derivatives supremum-and-infimum

asked Mar 18, 2015 at 15:42

1 vote

0 answers

39 views

Can GAP find isomorphisms to permutation groups which preserve / have additional properties?

permutations finite-groups algorithms gap

asked Feb 5, 2021 at 16:08

1 vote

1 answer

106 views

Can GAP test, if two ordinary character tables are isomorphic?

group-theory finite-groups computational-mathematics gap computer-algebra-systems

asked Mar 16, 2020 at 1:32

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45 Questions

Does the curvature determine the metric?

Proving irreducibility of $x^6-72$

Can MAGMA compute Auslander-Reiten sequences in group algebras?

Special formula for the permanent of the sum of two matrices

Is there an OpenSource CAS compatible with GAP where relatively fast computation of Hom$_{kG}(M,N)$ over "large" finite fields is possible?

How to construct submodules with GAP / MeatAxe?

MAGMA-question concerning the transformation of a $kG$-module $M$ into a right ideal of the group algebra

Does the curvature determine the metric for all surfaces

Question concerning the GAP package qpa (find all ideals with a certain property)

Non-central conjugacy class sizes in non-abelian groups of odd order

Correspondence between summands of a module and primitive idempotents of the endomorphism ring of the module

Can MAGMA compute pullbacks of $kG$-modules?

How to distinguish two "almost isomorphic" groups

How to construct an explicit isomorphism between two special endomorphism rings

How to find the irreducible constituents of a Brauer character with MAGMA?

How to extend scalars of a MeatAxe $kG$-module $M$ given in GAP?

Given an indecomposable $kG$-module $M$, can MAGMA compute a minimal projective cover of $M$?

How to do inflation of $k(G/N)$-modules with MAGMA?

MAGMA-question concerning the multiplicity of indecomposable $kG$-modules in a decomposable $kG$-module

Does MAGMA automatically identify $G$ and $G^\text{op}$?

Compute the values of two infinite products whose factors are the same

Question about matrix multiplication

Differentiable map conserving geodetic lines which is no isometry

Is there a computer programm or CAS (maybe GAP?) that can calculate with projective (indecomposable) A-modules (A is a finite dimensional k-algebra)?

Lemma about f.g. abelian groups endowed with a certain bilinear form

How to stop a calculation in GAP without closing GAP?

Interchanging summands among infinitely many infinite series

How to prove a certain inequality for a complex valued function using its derivative?

Can GAP find isomorphisms to permutation groups which preserve / have additional properties?

Can GAP test, if two ordinary character tables are isomorphic?