Abstract
In the present lecture I shall present an elementary procedure which can be used to study various aspects of magnon-magnon interaction and also magnon-phonon interaction. No magnonelectron interaction will be considered. The procedure can be applied to calculate magnon relaxation times, to calculate the correction to the spontaneous magnetization due to magnon interaction and, finally, we shall demonstrate how magnon interaction leads to formation of a two-magnon bound state.
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