4 citations · 13 across the 15 of their papers we have counts for
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An alternative construction of zip period maps for Shimura varieties
Qijun Yan
Let be the special fibre of a Shimura variety of Hodge type, with good reduction at a place above . We give an alternative construction of the zip period map for , which…
Twist polynomials of delta-matroids
Qi Yan, Xian'an Jin
Recently, Gross, Mansour and Tucker introduced the partial duality polynomial of a ribbon graph and posed a conjecture that there is no orientable ribbon graph whose partial dualit…
The Ihara-zeta function and the spectrum of the join of two semi-regular bipartite graphs
Xiaotong Li, Xian'an Jin, Qi Yan
In this paper, using matrix techniques, we compute the Ihara-zeta function and the number of spanning trees of the join of two semi-regular bipartite graphs. Furthermore, we show t…
Partial-dual genus polynomials and signed intersection graphs
Qi Yan, Xian'an Jin
Recently, Gross, Mansour and Tucker introduced the partial-dual genus polynomial of a ribbon graph as a generating function that enumerates the partial duals of the ribbon graph by…