There is an old open PR:
http://github.com/sympy/sympy/pull/1026
which tries to make orthogonal polynomials work
for symbolic order 'n'. An open question is
when to apply "simplifications" like:
L_n(-x) ---> (-1)**n * L_n(x)
L_{-n}(x) ---> L_{n-1}(x)
Do we want to have this:
a) at construction time
b) only when calling expand_func
Both approaches have their obvious advantages.
Please see the commits:
a) a958cb78c2bfd6d6e94dd05123f43195f2cdbe83
and
b) 659afc3474b146814279d39840c61f4c6589071c
to get an implementation of both approaches.
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