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Bijections for the Rogers-Ramanujan Reciprocal


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1 UER Mathematiques Et Informatique, Universite Bordeaux, 33405 Talence, France
     

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The Rogers-Ramanujan identities
The famous Rogers-Ramanujan identities are the following
1+∑qn2/(1-q)(1-q2)...(1-qn)=Π 1/(1-q5n+1)(1-q5n+4)                   (1)
1+∑qn2+n/(1-q)(1-q2)...(1-qn)=Π1/(1-q5n+1)(1-q5n+4)                 (2)
The history of the discovery of these marvelous identities by Rogers [14], Ramanujan [12] and Schur [15] is well known and has been related many times (see for example Andrews [1; Ch. 7] [2; Ch. 3], Hardy [12; Ch. 6]). Although this remarkable history starts in 1894, there have been recently a lot of activity among combinatorists around these identities. Adding to the fascination of this history, these same identities have recently appeared in statistical Physics in the beautiful exact solution by Baxter [5], [6] of the hard hexagon model.
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  • Bijections for the Rogers-Ramanujan Reciprocal

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Authors

Gerard Xavier Viennot
UER Mathematiques Et Informatique, Universite Bordeaux, 33405 Talence, France

Abstract


The Rogers-Ramanujan identities
The famous Rogers-Ramanujan identities are the following
1+∑qn2/(1-q)(1-q2)...(1-qn)=Π 1/(1-q5n+1)(1-q5n+4)                   (1)
1+∑qn2+n/(1-q)(1-q2)...(1-qn)=Π1/(1-q5n+1)(1-q5n+4)                 (2)
The history of the discovery of these marvelous identities by Rogers [14], Ramanujan [12] and Schur [15] is well known and has been related many times (see for example Andrews [1; Ch. 7] [2; Ch. 3], Hardy [12; Ch. 6]). Although this remarkable history starts in 1894, there have been recently a lot of activity among combinatorists around these identities. Adding to the fascination of this history, these same identities have recently appeared in statistical Physics in the beautiful exact solution by Baxter [5], [6] of the hard hexagon model.