#13413: fix integer overflow (?) in conversion of powersums to Schur functions
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Reporter: saliola | Owner: sage-
Type: defect | combinat
Priority: critical | Status: new
Component: combinatorics | Milestone: sage-5.13
Keywords: symmetric functions, | Resolution:
symmetrica, memleak | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by zabrocki):
I've spent some time looking through the Symmetrica code. It is not hard
to figure out the basic ideas behind the library, but it uses some very
terse C, non-obvious abbreviations, and a mix of German and English. It
also has very little documentation.
Symmetrica "longints" are a structure of three INTs w2,w1,w0 with
0<=w_i<=`2^15-1` plus a pointer to the next batch of 3 or NULL.
I've played with some programs that do some addition and multiplication
with these longints and I haven't been able to make them fail, but it must
be that in the calculation of `p([1]*36)` that some arithmetic fails when
some overflow occurs. It will almost definitely easier to identify the
bug in the library than to adapt it to another data structure.
--
Ticket URL: <http://trac.sagemath.org/ticket/13413#comment:17>
Sage <http://www.sagemath.org>
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