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This tag is reserved for questions where the problem has been vetted by this community and the observed behavior is confirmed to be a bug. Please do not use this tag for new questions. Please use the standard bugs header instead of version tags in conjunction with this tag.
10
votes
Accepted
Definition of Tube as a Region
I think you've found a bug! I think different parts of Mathematica deal with Tube differently.
Note that DiscretizeRegion thinks Tube is degenerate: evaluate DiscretizeRegion[Tube[]] for an error mess …
7
votes
2
answers
255
views
Trace works differently with different right-hand-side rules—bug?
Bug introduced in 2.1 or earlier and persisting through 13.2
UPDATE: Wolfram Support has confirmed that this is a bug.
I noticed that Trace does the following strange thing (v 13.0.0.0):
Trace[a*a*2, …
5
votes
Accepted
Surface integral with ImplicitRegion not working as expected?
This is a bug, but just wanted to post an answer to share what I found. Maybe it'll help someone at Wolfram figure out what's up.
Here's a plot of the region with the $z = 0$ plane shown.
Weird behav …
6
votes
Accepted
ComplexExpand no longer assumes Derivative[__][__][__] as real
Comments have identified this as a bug; in the meantime, a simple way to bring back the old behavior for ComplexExpand in a given session can be obtained by adding the following definition to ComplexE …
8
votes
MorphologicalEulerNumber misbehaving in 3D?
I think there are three possibilities:
this is a bug
Mathematica is using a definition of "Euler number" that does not mean "Euler characteristic"
the image is not being interpreted in the expected …