It has been proposed that within the framework of the analytically continued S-matrix all strongly interacting particles are composites, held together by forces associated with crossed'' channels. The essence of the ChewLow theory for the (3,3) resonance is that in first approximation this particle is a pion-nucleon composite, held together primarily by exchange of a nucleon. A mechanism, called the reciprocal bootstrap, is outlined to show that in the same sense and with the same degree of experimental verification the nucleon is approximately a composite of a pion and a nucleon, bound together to a large extent by exchange of a (3,3) resonance. (H.D.R.)
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Geoffrey F. Chew (1962) studied this question.