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cluster expansion
In statistical mechanics, the cluster expansion (also called the high temperature expansion or hopping expansion) is a power series expansion of the partition function of a statistical field theory around a model that is a union of non-interacting 0-dimensional field theories. Cluster expansions originated in the work of . Unlike the usual perturbation expansion, it converges in some non-trivial regions, in particular when the interaction is small.
==Classical case==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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