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We present a general formalism for calculating the renormalization effects which make strong interactions strong in simple gauge theories of strong, electromagnetic, and weak interactions. In an SU (5) model the superheavy gauge bosons arising in the spontaneous breakdown to observed interactions have mass perhaps as large as 10^17 GeV, almost the Planck mass. Mixing-angle predictions are substantially modified.
Georgi et al. (Mon,) studied this question.