Abstract
It is pointed out that the K-N interaction rather than the pi -N interaction plays the important role in the phenomena within the nucleon core. The processes of pion-nucleon scattering through the s-wave pion-pion interaction are classified into two pants, that is, the processes in the nucleon core and those in the neighborhood of the pion cloud. The contributions from the former to pion-nucleon scattering are estimated and are compared with those from the processes through the mechanism via the KK pi pi -interaction which may be regarded as one of the phenomena in the nucleon core. Moreover, some discussion about the anomalous magnetic moments of nucleons is made.
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