Questions - ASKSAGE: Sage Q&A Forum

150

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1

answer

no

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2024-02-28 11:20:08 +0200 eric_g

Confused about covariant derivatives and tensors in SageMath

82

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no

answers

no

votes

2024-02-19 16:46:11 +0200 AKGSage

Comparison between SageMath ODE solvers and Scipy ODE solvers

142

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1

answer

no

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2024-01-13 14:38:44 +0200 eric_g

Computing the Chern–Pontryagin invariant

294

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1

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no

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2024-01-03 10:28:39 +0200 idontgetoutmuch

Connection Forms not Anti-Symmetric

250

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2

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no

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2023-12-09 11:08:43 +0200 eric_g

Plotting transition-of-transition fails with "cannot evaluate symbolic expression"

188

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1

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2023-12-05 15:40:32 +0200 GPN

How to collect the derivatives in an expression for a scalar field

71

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2

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no

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2023-11-26 15:44:38 +0200 eric_g

Wrong result for gradient in spherical coordinates [closed]

sagemanifolds

373

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1

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no

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2023-11-26 11:29:26 +0200 achrzesz

How to express (-t^2 + x^2 + y^2 + z^2) as (x_μ)^2 ?

56

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1

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no

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2023-11-26 09:28:25 +0200 GPN

differential (1-form) simplifies a bit too much

60

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1

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no

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2023-11-21 14:51:30 +0200 eric_g

grad on a generic metric

207

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1

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no

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2023-11-21 11:22:35 +0200 eric_g

[CoCalc][SageManifolds] Error : Black hole rendering with SageMath 3

170

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1

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no

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2023-11-15 15:39:15 +0200 eric_g

[SageManifolds] Error : Black hole rendering with SageMath

184

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1

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no

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2023-11-15 15:06:14 +0200 eric_g

[CoCalc] [SageManifolds] Error : Black hole rendering with SageMath 2

162

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no

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1

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2023-09-08 00:42:22 +0200 John Palmieri

sqrt integral not working

112

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1

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no

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2023-08-31 10:17:12 +0200 eric_g

Covariant derivative

279

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no

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1

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2023-05-24 04:51:20 +0200 Jack Zuffante

Geodesic Won't Plot

115

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1

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no

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2023-03-09 01:08:52 +0200 Florentin Jaffredo

Switching coordinate charts mid-integration with solve_across_charts

108

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1

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no

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2022-08-28 22:02:29 +0200 Sébastien

Manifold not defined

sagemanifolds

180

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1

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1

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2022-08-16 19:32:45 +0200 eric_g

Sage Manifolds: Asymptotically de Sitter Spacetime in Fefferman-Graham Gauge

184

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no

answers

no

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2022-05-27 08:57:45 +0200 Bubbz

Coordinate chart restriction raising a floating-point-overflow error

210

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1

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1

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2022-05-23 08:17:32 +0200 eric_g

How to convert a list to components of a PseudoRiemannian metric

148

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1

answer

1

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2022-05-02 15:02:19 +0200 kva

Evaluating the tangent vector of a previously saved and loaded integrated geodesic

415

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1

answer

1

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2022-02-25 22:19:12 +0200 eric_g

conjugate of scalar field

202

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1

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1

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2022-01-28 14:41:12 +0200 eric_g

Tensor product of exterior power

184

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1

answer

1

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2021-12-18 17:08:58 +0200 eric_g

full metric transform

276

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1

answer

2

votes

2021-05-11 16:06:36 +0200 Florentin Jaffredo

Geodesics/tangent vector evaluation interpolation error

143

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no

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no

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2021-04-12 06:19:54 +0200 perfectly_odd

Is there a way to compute the "correct" distributional answer, -4pidirac_delta(r), as the Laplacian of 1/r (in spherical coordinates on Euclidean space)?

241

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1

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1

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2021-04-08 09:55:39 +0200 eric_g

Is there a built-in way to integrate a vector or differential form field on an embedded submanifold of Euclidean space?

265

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1

answer

1

vote

2021-04-03 16:46:21 +0200 slelievre

Coordinate charts, functions of one coordinate as bounds of another(?)

252

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1

answer

4

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2021-03-30 16:32:33 +0200 Florentin Jaffredo

84 questions

Confused about covariant derivatives and tensors in SageMath

Comparison between SageMath ODE solvers and Scipy ODE solvers

Computing the Chern–Pontryagin invariant

Connection Forms not Anti-Symmetric

Plotting transition-of-transition fails with "cannot evaluate symbolic expression"

How to collect the derivatives in an expression for a scalar field

Wrong result for gradient in spherical coordinates [closed]

How to express (-t^2 + x^2 + y^2 + z^2) as (x_μ)^2 ?

differential (1-form) simplifies a bit too much

grad on a generic metric

[CoCalc][SageManifolds] Error : Black hole rendering with SageMath 3

[SageManifolds] Error : Black hole rendering with SageMath

[CoCalc] [SageManifolds] Error : Black hole rendering with SageMath 2

sqrt integral not working

Covariant derivative

Geodesic Won't Plot

Switching coordinate charts mid-integration with solve_across_charts

Manifold not defined

Sage Manifolds: Asymptotically de Sitter Spacetime in Fefferman-Graham Gauge

Coordinate chart restriction raising a floating-point-overflow error

How to convert a list to components of a PseudoRiemannian metric

Evaluating the tangent vector of a previously saved and loaded integrated geodesic

conjugate of scalar field

Tensor product of exterior power

full metric transform

Geodesics/tangent vector evaluation interpolation error

Is there a way to compute the "correct" distributional answer, -4pidirac_delta(r), as the Laplacian of 1/r (in spherical coordinates on Euclidean space)?

Is there a built-in way to integrate a vector or differential form field on an embedded submanifold of Euclidean space?

Coordinate charts, functions of one coordinate as bounds of another(?)

Integrating geodesics backwards in time

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