  Classical electrodynamics in flat 3+1 space-time has a very special retarded
propagator delta(x^2) localized on the light cone, so that a particle does not
interact with its past field. However, this is an exception, and in flat
odd-dimensional space-times as well as generic curved spaces this is not so. In
this work we show that the so called self-force is not only non-zero, but it
matches (in 2+1 dimensions) the radiation reaction force derived from the
radiation intensity.
