Hi!
The title says it all.
testcase:
sage: latex(RootSystem("A2").ambient_space().simple_root(1))
e_{0} + \left(-1\right)e_{1}
expected output:
e_{0} - e_{1}
Of course it should work also for weights and should be capable of
producing output like
-3e_{1}+e_{2}
Best regards
Vit
P.S.: I am not familiar with sage and its internals but I've checked
misc.py/repr_lincomb and it seemed fine at a first glance. Do the test
cover also linear combinantions with negative coefficients? Documentation
for repr_lincomb seems to show only terms with positive coefficients.
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