My problem is How to use events command in dsolve/numeric for different points of independent variable?                                     A simple example:

de:=diff(x(t),t)=-x(t);

ds:=dsolve({de,x(0)=1}, numeric, method = rkf45,abserr=1E-12,relerr=1E-11,events =[[x(t)-1E-8,halt]]);

works perfectly, but I need to compare x(t) and x(t-h) in two consecutive...