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Michael Prange, prange at sdr.slb.com wrote: > Is there a package which includes step functions, delta functions, and > the integrals and derivatives of these functions combined with other > functions? I wrote a package DeltaTheta.m about a year and a half ago. You can FTP it from zaphod.ncsa.uiuc.edu, /UNIX/Symbolic/Mathematica/Packages/JANHUNEN, or from nic.funet.fi, /pub/sci/math/mathematica/PJ. It has not yet been tested on Mma 2.0. Pekka Janhunen, Finnish Meteorological Institute, Geophysics Department email: pjanhune at finsun.csc.fi.