Conserved finite four-vector for particlelike solutions to nonlinear classical field theories

The purpose of the letter is to show that a global noncanonical or secular four-vector of finite value can ordinarily be defined by spatial integration for a localized particlelike solution in a Lorentz covariant (i.e. does not accelerate in response to) an external field. This secular four-vector is a finite constant of the motion even if the particlelike solution has an infinite canonical energy