Experiments with a Positivity-Preserving Operator

Kauers,  Manuel; Zeilberger, Doron

Experiment. Math., Tome 17 (2008) no. 1, p. 341-345 / Harvested from Project Euclid

Résumé

We consider some multivariate rational functions that have (or are conjectured to have) only positive coefficients in their series expansion. We consider an operator that preserves positivity of series coefficients, and apply the inverse of this operator to the rational functions. We obtain new rational functions that seem to have only positive coefficients, whose positivity would imply positivity of the original series, and that, in a certain sense, cannot be improved any further.

Publié le : 2008-05-15
Classification: Positivity, special functions, computer algebra, 05A15, 33F10

@article{1227121387,
     author = {Kauers,  Manuel and Zeilberger, Doron},
     title = {Experiments with a Positivity-Preserving Operator},
     journal = {Experiment. Math.},
     volume = {17},
     number = {1},
     year = {2008},
     pages = { 341-345},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1227121387}
}

Kauers,  Manuel; Zeilberger, Doron. Experiments with a Positivity-Preserving Operator. Experiment. Math., Tome 17 (2008) no. 1, pp.  341-345. http://gdmltest.u-ga.fr/item/1227121387/