#15505: Braid Group construction misses some relations
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Reporter: mmarco | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: group theory | Resolution:
Keywords: braid groups | Merged in:
Authors: mmarco | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by tscrim):
The if statement is always true since `range(a, b)` is `[a, a+1, ..., b-2,
b-1]` (or you can think of it as the integer points in th internal `[a,
b)`). So I think this should work:
{{{#!python
for i in range(1, n):
rels.append(free_group([i, i+1, i, -i-1, -i, -i-1]))
for j in range(i+2, n+1):
rels.append(free_group([i, j, -i, -j]))
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15505#comment:2>
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