Hi Mike,

Very impressive work! I am glad you took over my initial patch.
I will send you more comments off-line except for the main issues
that need to be discussed with everyone.

Franco:

>> Moreover, LLT polynomials, Hall-Littlewood, Jack and Macdonald symmetric
>> functions have all been moved into SymmetricFunctions(R).
>>
>> sage: Mac = SF.macdonald()
>> gives an error because q and t are not in the ring! (this is different
>> behavior than before where the q and t were added to the base ring)
> 
> Why can't SF.macdonald() just return the appropriate thing?

This is what was discussed during the Sage Days 38 in Montreal. SF needs
to specify the base and macdonald() does not live in the ring of symmetric
functions without q,t.

> If you really are going to do this, then you need to improve the error 
> message:
> 
>     ValueError: parameter q must be in the base ring
> 
> Perhaps we can include in the error message the command that would
> produce what the user wants?

That might be a good idea!

Best,

Anne

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