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SageManifold example broken in SageMath 7.3

asked 2016-08-12 12:39:13 -0500

Richard_L gravatar image

updated 2016-08-12 20:29:36 -0500

The example SM_sphere_S2 breaks when it gets to section 'Tangent Spaces', thus:

AttributeError: 'DifferentiableManifold_with_category' object has no attribute 'tangent_space'.

referring to the manifold S2.

Why would a differentiable manifold not have a tangent space? or does the example need to be modified?

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answered 2016-08-13 07:41:06 -0500

eric_g gravatar image

updated 2016-08-13 07:44:18 -0500

This is because SageManifolds is not fully integrated in SageMath 7.3. Only the part corresponding to the tickets #15916 to #18783 in the list https://trac.sagemath.org/ticket/18528 is there. As you can see, tangent spaces (ticket #19092) are not in SageMath yet. Hopefully, it will be in version 7.4. Meanwhile, simply install the full SageManifolds atop SageMath 7.3 by following these instructions and all the S^2 examples should pass.

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Thanks. I take it that manifolds-0.9 remains the definitive, stable version until further notice.

Richard_L gravatar imageRichard_L ( 2016-08-13 13:19:58 -0500 )edit

Yes indeed.

eric_g gravatar imageeric_g ( 2016-08-14 02:29:35 -0500 )edit

@Richard_L, you can accept (by clicking the tick mark) and upvote (by clicking the up arrow) erig_g's answer, so that your question is marked in the list of Ask Sage questions as solved.

slelievre gravatar imageslelievre ( 2016-08-16 17:41:08 -0500 )edit

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Asked: 2016-08-12 12:39:13 -0500

Seen: 122 times

Last updated: Aug 13 '16