27,763 research outputs found
Double Hurwitz numbers via the infinite wedge
We derive an algorithm to produce explicit formulas for certain generating
functions of double Hurwitz numbers. These formulas generalize a formula of
Goulden, Jackson and Vakil for one part double Hurwitz numbers. Immediate
consequences include a new proof that double Hurwitz numbers are piecewise
polynomial, an understanding of the chamber structure and wall crossing for
these polynomials, and a proof of the Goulden, Jackson and Vakil's Strong
Piecewise Polynomiality conjecture. The method is a straightforward application
of Okounkov's expression for double Hurwitz numbers in terms of operators on
the infinite wedge. We begin with a introduction to the infinite wedge tailored
to our use.Comment: 25 pages, 2 figures. Comments welcom
Two generic transfers and a synonymy for some North American Elateridae (Coleoptera)
During various studies, three instances of necessary taxonomic change were found. These changes are provided here to clarify the taxonomy of these taxa for those studies
Extension of Nakagawa & Schielzeth's R2GLMM to random slopes models
1.Nakagawa & Schielzeth extended the widely used goodness-of-fit statistic R2 to apply to generalized linear mixed models (GLMMs). However, their R2GLMM method is restricted to models with the simplest random effects structure, known as random intercepts models. It is not applicable to another common random effects structure, random slopes models.<p></p>
2.I show that R2GLMM can be extended to random slopes models using a simple formula that is straightforward to implement in statistical software. This extension substantially widens the potential application of R2GLMM.<p></p>
Playing God: Inquiry into a Slogan
Roll 64. Flo & Don Guese Wedding (Castiglione). Image 10 of 39. (18 July, 1953) [PHO 1.64.16
- …