I apologize if this is obvious, but how to I add an assumption to a symbol?  I 
know there are two dueling assumptions systems for the time being, and the 
solver seems to use the older one.

if I create a symbol:
s=symbol('s',real=True)

and later want to add the assumption that 's' is also positive, what is the 
right way to do that? 


Thanks—
Greg

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