tag:blogger.com,1999:blog-11295132.post112077694645273703..comments2015-05-30T22:32:59.468-07:00Comments on A Neighborhood of Infinity: Heaviside Operators and Umbral CalculusDan Piponihttps://plus.google.com/107913314994758123748noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-11295132.post-6390395414917910512007-02-23T15:21:00.000-08:002007-02-23T15:21:00.000-08:00Interessting, but there are some glitches:(D-3)(D-...Interessting, but there are some glitches:<BR/>(D-3)(D-2)=D^2-5D+6, but the original equation has -6D. So you're solving the equation with -5D instead, which is impressive enough. In one line the exp function is missing, and the unused last term of the taylor series (very clever, it's infinite, but applied to a polynom almost all terms vanish...) is wrong.<BR/><BR/>I don't understand the equation for exchanging f(D) and exp(at) at all, must think more about it.<BR/><BR/>At school, we only multiplied dx away from d/dx, and then integrated; and I thought <I>that</I> was strange.ChristianSnoreply@blogger.com