Biranks for Partitions into 2 Colors

Details Biranks for Partitions into 2 Colors Biranks for Partitions into 2 Colors

2009-09-26

arxiv.org/abs/0909.4892v1

Mathematics

Number Theory

20 pages

Scientific paper

In 2003, Hammond and Lewis defined a statistic on partitions into 2 colors which combinatorially explains certain well known partition congruences mod 5. We give two analogs of Hammond and Lewis's birank statistic. One analog is in terms of Dyson's rank and the second uses the 5-core crank due to Garvan, Kim and Stanton. We discuss Andrews's bicrank statistic and how it may be extended. We also generalize the Hammond-Lewis birank to a multirank for multipartitions and the Andrews bicrank to a multicrank for extended multipartitions. These both give combinatorial interpretations for multipartition congruences modulo all primes t>3.

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