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