<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _check_integrate_dt(t,dt):
 """Check that the stepszie in t is an integer x dt"""

    if dt is None:
        return True
    mult= round((t[1]-t[0])/dt)
    if nu.fabs(mult*dt-t[1]+t[0]) < 10.**-10.:
        return True
    else:
        return False