Indicator function of the set A, where A = (-infinity,u)
diracS1(u, x)
u
x
diracS1(u,x)=1 if x<u and diracS1(u,x)=0 in other case.
Veronica A. Gonzalez-Lopez
dirac1, dirac2, diracS2
dirac1
dirac2
diracS2