Contribution to the

Theory of Ferromagnetism

1925

Text:

This excerpt of the Hamburg dissertation (1924)

was first published in «Zeitschrift für Physik»,

vol. XXXI, 1925 (received on 9 December 1924).

Technical note:

The underlined letters H, J and M represent the same

letters of the original text in Old English letterface.

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Content:

1. Assumptions

2. The simple linear chain

3. The three-dimensional model