Opened 7 years ago
Closed 7 years ago
#13800 closed defect (fixed)
sign error in Steenrod algebra multiplication
Reported by: | cnassau | Owned by: | jhpalmieri |
---|---|---|---|
Priority: | minor | Milestone: | sage-5.6 |
Component: | algebraic topology | Keywords: | Steenrod algebra |
Cc: | Merged in: | sage-5.6.beta2 | |
Authors: | Christian Nassau | Reviewers: | John Palmieri |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
There is a sign error in the Steenrod multiplication routine at odd primes: with
A=SteenrodAlgebra(3) Q=A.Q_exp P=A.P print (Q(0,1)*P(3))*Q(1,1) print Q(0,1)*(P(3)*Q(1,1))
one gets
Q_0 Q_1 Q_2 2 Q_0 Q_1 Q_2
Only the 2nd answer is correct.
Apply trac_13800-cn.patch.
Attachments (1)
Change History (7)
comment:1 Changed 7 years ago by
- Status changed from new to needs_review
comment:2 Changed 7 years ago by
- Reviewers set to John Palmieri
comment:3 Changed 7 years ago by
Hi John, the indentation is now fixed. Hope I'll have something less trivial to contribute some day ;-)
Changed 7 years ago by
comment:4 Changed 7 years ago by
- Description modified (diff)
- Status changed from needs_review to positive_review
I couldn't get your patch to apply, so I made a new one. Mercurial queues are a good way to deal with this sort of situation, in my experience.
comment:5 Changed 7 years ago by
- Milestone changed from sage-5.5 to sage-5.6
comment:6 Changed 7 years ago by
- Merged in set to sage-5.6.beta2
- Resolution set to fixed
- Status changed from positive_review to closed
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Hi Christian, welcome aboard. The patch looks very good, except for a very minor detail: the example in the doctest should be indented one more space. Fix that, and I'll give it a positive review. By the way, if you want, you can add your name to the list of account names on the wiki.