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 Jan21 awarded Notable Question Aug5 awarded Popular Question Dec8 awarded Popular Question Apr14 accepted Series expansion in terms of Hermite polynomials Apr14 asked Series expansion in terms of Hermite polynomials Dec13 awarded Custodian Dec13 reviewed Approve Singular integral: NIntegrate fails to converge Dec13 awarded Supporter Dec13 accepted Singular integral: NIntegrate fails to converge Dec13 revised Singular integral: NIntegrate fails to converge edited title Dec13 asked Singular integral: NIntegrate fails to converge Dec3 comment How to define a differential operator? Oh, I deleted it because I came up with a solution op[x,t][Exp[x t]]/Exp[x t], where I've actually gotten my polynomial, though with the variables that switched places. But your solution is much more generic, thanks again! Dec3 comment How to define a differential operator? Thanks! Shame that it's a bit more complicated than I thought to get the roots of a polynomial, but that will work. Dec3 accepted How to define a differential operator? Dec3 comment How to define a differential operator? I am new to Mathematica, so my only guess was to create 2 distinct functions, one behaving like differential operator, other like a polynomial. I was wondering if there was a way to write it in 1 statement. Dec3 asked How to define a differential operator? Nov29 awarded Scholar Nov29 comment Problem with function as an argument Thank you, this is exactly what I needed! Nov29 accepted Problem with function as an argument Nov22 awarded Student