Abstract
On the basis of a moment method developed in a previous paper, several well-known approximation methods: the method of Guggenheim and McGlashan, Yang and Li, and of Kikuchi-Hijmans-De Boer, are rederived by restriction to the first moment.
Furthermore, using the second- and third moment, explicit expressions for the semi-invariants ¿2IL are given for the case that the interaction is restricted to pairs of nearest neighbours.
Original language | English |
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Pages (from-to) | 981-996 |
Number of pages | 16 |
Journal | Physica |
Volume | 26 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1960 |