The self-consistency of the kinematics of special relativity, IV

Further support is provided for the self-consistency of the kinematics of the special theory of relativity (KSTR) (I) by considering Einstein's formula for the general Doppler effect; (2) by reconsidering some arguments by Dingle and by McCausland; (3) by answering questions from a referee who thought McCausland had an absolute physical concept in mind, but which I claim is either metaphysical or Newtonian, or else incorrect when interpreted operationally. A swings-and-roundabouts theorem is proved for the round-trip clack paradox. It is tentatively suggested that parity breakdown might be caused by the weak microwave cosmic radiation and that this could be experimentally tested. Some prehistory is recalled concerning the branching universe theory of H.J. Everett.