Is there such a thing as a truly point particle, ie one with dimensions? Alternatively, is possible for there to be any fundamental particle which is not a point particle? It seems to me that an "electron" for example does not exist beyond its electric field, mass (resistance to motion) and other similar properties. In turn the electric field does not exist beyond its influence on other particles (if only one charged particle existed, there would be no reason to assume the existence of an electric field). So the only existence an electron has is in its relation to other things. In this sense, an "electron" as such does not exist at all as a "particle" and the concept of it having spacial extent is meaningless. By applying this logic to other fundamental particles its seems to me that you can deduce that all fundamental particles must be "pointlike". Sorry if this is all a bit jumbled and badly explained, and i hope i put it in the right forum.