Location: ** Hill 525 (Note room change) **

Date & time: Friday, 20 July 2018 at 5:00PM - 6:00PM

*Abstract:* The Wilf-Zeilberger theory has become a bridge between symbolic computation and combinatorics.

Through this bridge, not only classical combinatorial identities from handbooks and long-standing conjectures in enumerative combinatorics are proved algorithmically, but also some new identities and conjectures related to mathematical constants are discovered via computerized guessing.

WZ-pairs play a leading role in the WZ theory whose early applications can be traced back to Andrei Markov's 1890 method for convergence-acceleration of series for computing ?(3). For applications, it is crucial to have WZ-pairs at hand. In the previous works, WZ-pairs are cooked either by guessing from the identities to be proved using Gosper'algorithm or by certain transformations from a given WZ-pair.

In this talk, we first present a structure theorem on the possible form of all rational WZ-pairs, and then we will illustrate how one could go beyond the rational case using Ore-Sato theorem.

We hope these studies could enable us discover more combinatorial identities in an intrinsic and algorithmic way.

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Department of Mathematics
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