Talk:Pincherle derivative

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 Field:  Algebra

"ad"?[edit]

This article begins with this definition:

the Pincherle derivative of a linear operator on the vector space of polynomials in the variable over a field is another linear operator defined as
so that

It doesn't say what "ad" is. It should. Michael Hardy (talk) 23:51, 3 July 2009 (UTC)