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which is the well-known result quoted by Lategan. The first term on the right of Eq. (3) represents the rate of emission by luminous sources, and the second term represents the rate of absorption by luminous sources only. Since sources exist that have decayed and become nonluminous, the second term must include absorption by both luminous and nonluminous sources, and the differential equation should therefore take the form

Widespread error in a standard problem in the dynamics of deformable bodies