New proof of a conjecture linking graphs and lattice paths to Onsager's formula in the Ising model.
A new proof is given of a certain conjecture due to Feynman. This conjecture relates graphs and paths on a lattice and was first proved by Sherman. It is the key step in a particular method of obtaining Onsager's formula for the partition function of the two-dimensional Ising model.
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P. N. Burgoyne (1963) studied this question.
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