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Why doesn't '==' or '!=' work for mixed forms?

asked 2020-07-10 21:02:22 +0100

sum8tion gravatar image

I have the following setup

M = Manifold((4), 'M', field='complex')
U = M.open_subset('U')
x = U.chart(names=tuple('x_%d' % i for i in range(4)))
eU = x.frame()

Form0 = M.mixed_form(comp=([0,0,0,0,0]))
Form1 = M.mixed_form(comp=([1,0,0,0,0]))

Clearly Form0 and Form1 are distinct mixed forms of M, but when I run

if Form0 != Form1:
    print('Not Equal')

I get 'Equal' as the output, what's going wrong?

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2 Answers

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answered 2020-07-11 12:22:53 +0100

mjungmath gravatar image

I already started an attempt to fix this: Until this is resolved, you can use ==. This works fine.

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answered 2020-07-11 12:21:01 +0100

FrédéricC gravatar image

This is a bug. the _richcmp_ method of mixed form only make sense for ==. Read the code

sage: Form0._richcmp_??
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Asked: 2020-07-10 21:02:22 +0100

Seen: 319 times

Last updated: Jul 10 '20