I am interested in problems in
and number theory.
I am currently a postdoc in the
part of the
Herbold Computational Biology Program
at the Fred Hutch Cancer Center.
I was previously a postdoc at the University of Washington
where my mentor was Farbod Shokrieh.
Before that I was a graduate student at the University of Michigan
where my advisors were David Speyer
and Jeff Lagarias.
I was on the academic job market in fall 2019.
Before graduate school I studied math at
and the Math in Moscow program.
hrichman (at) alum (dot) mit (dot) edu
My work can be found on
"Dilated floor functions that commute,"
J. C. Lagarias and T. Murayama.
American Math. Monthly 123.10 (2016), pp. 1033-1038.
"Dilated floor functions having nonnegative commutator I. Positive and mixed sign dilations,"
Acta Arithmetica 187.3 (2019), pp. 271-299.
"Dilated floor functions having nonnegative commutator II. Negative dilations,"
Acta Arithmetica 196.2 (2020), pp. 163-186.
"Derangements and the p-adic incomplete gamma function,"
Transactions of the American Mathematical Society 376 (2023), pp. 1065-1087.
"Counting tripods on the torus,"
Jayadev S. Athreya and David Aulicino.
Arnold Mathematical Journal 9 (2023), pp. 359-379.
"The tropical Manin-Mumford conjecture,"
International Mathematics Research Notices 2023.21 (2023), pp. 18714-18751.
"The floor quotient partial order,"
Advances in Applied Mathematics 153 (2024).
"The distribution of Weierstrass points on a tropical curve,"
"Tropical Weierstrass points and Weierstrass weights,"
Omid Amini and Lucas Gierczak,
"The family of $a$-floor quotient partial orders,"
"Lower rational approximations and Farey staircases."
"Counting two-forests and random cut size via potential theory,"
Farbod Shokrieh and Chenxi Wu.
"Minors of tree distance matrices,"
Farbod Shokrieh and Chenxi Wu,
"Origami hexagon deformations and the flip graph,"
coauthored with Y. Liu,
"The Möbius function of the poset of triangular numbers under divisibility,"
coauthored with R. Pandey,
"Weierstrass points and torsion points on tropical curves."
Notes and Presentations
"Matchings in convergent graph sequences," March 2017
"Moduli space of tropical curves," June 2017
"Local Gauss-Lucas theorem," July 2017
"Dilated floor functions having nonnegative commutator," July 2017
"Descartes' rule and beyond," September 2017
"Distribution of tropical Weierstrass points," September 2018
"The poset of floor quotients,"
"Weierstrass points and torsion points on tropical curves,"
"Continuity over p-adic numbers,"
"Derangements and a p-adic incomplete gamma function,"
"Uniform bounds on tropical torsion points,"
"Distance matrices and equilibirum measures on trees,"
"Tropical weights of Weierstrass points,"
"Phylogenetic trees to integer vectors,"
Quotes about math
built by Amanda Ghassaei
guidelines provided by Acta Arithmetica
Math Subject Classification
browse and search, resource from zbMATH
Online Encyclopedia of Integer Sequences
database and search engine for combinatorial statistics and maps
Eugenia Cheng on the lecture system
Why should I do math?
Reasons by Tao Lin
(43., 35., 31., 10., 28., 8., 11., 14., 41., 26., 21., 18.)