Hey,

In any case, I think it should be clearly documented that, for good 
> performance, one should avoid cross-parent arithmetic operations 
> altogether, or one should at least keep a pointer to the parent of the 
> result. 
>
> But where should I put such a warning? I don't think 
> sage.structure.coerce would be a good location, because only experts 
> would look there. So, it should be a (thematic) tutorial. What would you 
> suggest? Speaking of tutorials, I should finally try to convert my 
> coercion 
> worksheet into a tutorial... 
>

   I think a tutorial on coercion would be useful (in particular, one on 
how to implement the coercion model; maybe there is already one and I just 
haven't found it yet...), but perhaps we should also have a tutorial on 
writing efficient sage code and the little nuances that can affect run 
speed (such as arithmetic in a common parent)?

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