On Tuesday, April 9, 2019 at 2:34:38 PM UTC+10, Martin R wrote: > > Dear Travis! > > Thank you for the hint! I got a bit further, but I'm still stuck. Here > is a minimal non-working example. > > I suspect that the problem is my not understanding of the hint in > IndexedFreeModuleElement.__init__: > > ------------------------------- > """ > Create a combinatorial module element. This should never be > called directly, but only through the parent combinatorial > free module's :meth:`__call__` method. > ------------------------------- > > That is a complete red herring. Basically it is saying you should always construct elements by P(foo), where P is the parent object, not by ElementClass(P, foo). What you need to do is add a __call__ method to TwoPositionsElement to redirect to (or be an alias for) the plethysm method.
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