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Question: About diff in unapply

Question:About diff in unapply

dongtian@jlu.edu.cn 15
diff
April 12 2011
1

I want to construct a functional with

f:=unapply(diff(eta[i],x)=k[i]*e[i], i);

but get

f:i->0=k_ie_i

Any one can help me? 
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