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Irving Zhu
02/23/09 03:35am

Hi All,

I am having some problems with Simplify[] or FullSimplify[].

Suppose I have some function

f[x_, t_]:= x * g[d] + t* h[d] + ...
where d[x_,t_]:=... is an intermediate variable also expressed in x and t.

Supposed I want to find out D[f[x,t],t]. Now if a human being is to do this, he or she will try to express the results in a mix of d, x, and t in such a way that the end result "looks simple."

If Mathematica were to do it, it will express the end result only in x and t, and this makes the end result extremely complicated.

I tried D[f[x,t],t], Simplify[D[f[x,t],t]], and FullSimplify[D[f[x,t],t]], and none of them will express the end result with intermediate variables to make it simple.

Does anyone know how to do this with Mathematica?

Thanks,
Irving Zhu



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Subject (listing for 'Smart Simplify with intermediate variables')
Author Date Posted
Smart Simplify with intermediate variables Irving Zhu 02/23/09 03:35am
Re: Smart Simplify with intermediate variables yehuda ben-s... 02/24/09 08:18am
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