#16264: Rotate error on childless binay trees
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Reporter: VivianePons | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: combinatorics | Resolution:
Keywords: combinat, Tamari, binary trees | Merged in:
Authors: Viviane Pons | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by stumpc5):
What is wrong with returning the same object for the following reason:
The tree
{{{
y
/ \
x C
/ \
A B
}}}
is mapped to
{{{
x
/ \
A y
/ \
B C
}}}
for nodes x and y and trees A,B,C. Now suppose that x doesn't exist and
that A,B are empty. Then both pictures become
{{{
y
\
C
}}}
This tree can thus be though of being fixed by the map.
--
Ticket URL: <http://trac.sagemath.org/ticket/16264#comment:4>
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