The file SHARE1;DELTA FASL contains a function DELINT which can do integrals
which contain Dirac delta functions.  The calls are DELINT(expr,var) and
DELINT(expr,var,lower_limit,upper_limit).  These give the indefinite
and definite integrals respectively.  The delta function is represented
by DELTA(argument); the step function (which is returned by the indefinite
integral) by THETA(argument).  These functions are not defined in the file.
	Currently lower_limit must be lower than upper_limit. This will be
corrected in a later version.  Currently derivatives of delta's
are not handled.  This may be put in later.  Error checking is currently
minimal.
	If there is no delta function in expr whose argument depends on
var,DELINT calls INTEGRATE.
BATCH file: SHARE1;DELTA >
DEMO SHARE1;DELTA DEMO.
Comments, bugs to MPS.