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Sagemanifolds display has deteriorated

asked 2020-08-12 13:13:41 -0500

danielvolinski gravatar image

Hi All,

I've noticed a deterioration in the display of objects in SageManifolds, I'm using the following code:

%display latex

R3 = Manifold(3, 'R3', start_index=1, latex_name=r'\mathbb{R}^3')
cartesian3d.<x,y,z> = R3.chart()

omega = R3.diff_form(1, 'omega', latex_name=r'\omega')
omega[:] = (y, z, x)
print(omega)
omega.display()

In SageMath for Windows Native 8.1 the display command would display the Greek letter omega. On the other hand in SageMath for Windows Native 9.0 and 9.1 the display command displays the word omega, not the Greek letter.

Is this a bug?

Daniel

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answered 2020-08-12 15:26:52 -0500

eric_g gravatar image

updated 2020-08-12 16:44:10 -0500

Please use

omega = R3.diff_form(1, name='omega', latex_name=r'\omega')

to get a correct LaTeX display in Sage 9.1 (notice name='omega' instead of a mere 'omega').

Actually, the change that occured between Sage 8.1 and Sage >= 8.8, is that the unnamed arguments are now assumed to be some components to initialize the diff form. For instance, you can now declare and initialize omega in a single line:

omega = R3.diff_form(1, (y, z, x), name='omega', latex_name=r'\omega')
omega.display()

$$\omega = y \mathrm{d} x + z \mathrm{d} y + x \mathrm{d} z$$

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I understand. Thanks Eric

danielvolinski gravatar imagedanielvolinski ( 2020-08-12 17:55:59 -0500 )edit

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Asked: 2020-08-12 13:13:41 -0500

Seen: 49 times

Last updated: Aug 12