Natasha Dobrinen
Natasha Dobrinen

University of Denver
Department of Mathematics
C.M. Knudson Hall 302
Working Office: Physics Building Room 218
Denver, CO 80208
email: Natasha.Dobrinen at

I am a set theorist working on interactions between logic, combinatorics, and topology. Before coming to DU, I held postdoc positions at the Kurt Gödel Research Institute for Mathematical Logic under the mentorship of O. Univ. Professor Sy-David Friedman and The Pennsylvania State University under the mentorship of Professor Stephen G. Simpson. I earned a PhD at the University of Minnesota under the supervision of Professor Karel Prikry. While earning my bachelors degree in math at UC Berkeley, I completed an Honors Thesis under the direction of Professor Richard E. Borcherds. Current research focuses include Ramsey theory of infinite structures, the structures of compact spaces, and applications of set-theoretic methods in their analysis.

An article on being a mathematician

BLAST 2018 was held at the University of Denver, August 6 - 10. We had over 70 participants from around the world, including over 20 graduate students. See the conference website. BLAST 2019 will be held at CU Boulder.

BLAST is an interdisciplinary conference series focused Boolean algebras, Lattices, Universal algebra, Set theory and Topology, and their interactions. This is a good conference for graduate students, early career mathematicians, and anyone interested in expanding their research to include some neighboring areas. We are grateful for National Science Foundation funding for the BLAST Conference Series.

Association for Symbolic Logic.

As of January 1, 2018, I am Chair of the ASL Committee on Logic in North America and a member of the ASL Council. Past service includes a 3-year term on the Committee on Logic in North America, and a two-year term on the ASL Web Advisory Committee.

Advising and Postdoctoral Mentoring.

I was PhD advisor to Timothy Trujillo who earned his PhD in Spring 2014, with thesis: Topological Ramsey spaces, associated ultrafilters, and their applications to the Tukey theory of ultrafilters and Dedekind cuts of nonstandard arithmetic. Dissertation_Trujillo_2014 Currently I am co-advising Sonia Navarro Flores (with Michael Hrusak) on her PhD thesis at UNAM.

From Fall 2013 - Spring 2015 was mentor to postdoctoral scholar Jose Mijares. In 2015 I co-advised (with David Meza-Alcantara) Sonia Navarro Flores on her masters thesis at UNAM Morelia, Mexico. From Fall 2015 - Spring 2018, I mentored DU postdoctoral scholar Daniel Hathaway. From October 2018 - September 2019 I will be a research mentor to visiting scholar Dr. Kaiyun Wang from the College of Mathematics and Information Science, Shaanxi Normal University.

Recent and Upcoming Invited Talks, Workshops, Tutorials, and Panels. See my Invited Talks Page for talks from 2015 - 2016.

Arctic Set Theory Workshop 4, Kilpisjaervi, Finland, January 21-26, 2019.

ASL Winter Meeting, at the Joint Mathematics Meetings, Baltimore, January 18-19, 2019, (plenary).

Unifying Themes in Ramsey Theory, Banff International Research Station, November 18-23, 2018.

Notre Dame Logic Seminar, September 4, 2018. Ramsey theory of homogeneous structures

Generalised Baire Spaces, Amsterdam, The Netherlands, August 22-24, 2018. Perfect tree forcings for singular cardinals

Ramsey Theory in Logic, Combinatorics and Complexity, Bertinoro International Center for Informatics, Italy, July 15 - 20, 2018. Bertinoro talk

SETTOP, Novi Sad, Serbia, July 2-5, 2018, (plenary). (similar to Bertinoro talk)

Logic Seminar, University of Illinois, Urbana-Champaign, May 21, 2018. (chalk talk)

Association for Symbolic Logic North American Annual Meeting, May 16-19, 2018, Special Session on Set Theory. (chalk talk)

Logic Seminar, University of Illinois, Chicago, April 24, 2018. (similar to JMM talk)

52nd Spring Topology and Dynamical Systems Conference, Auburn University, March 14-17, 2018, Special Session on Set-theoretic topology. Applications of high dimensional Ellentuck spaces

ASL-AMS Special Session on Ramsey theory, set theory and logic, Joint Mathematics Meeting, San Diego, January 10-11, 2018. JMM talk

NUI Galway, School of Mathematics, Statistics and Applied Mathematics Seminar, December 7, 2017.

Workshop on Ultrafilters, Ramsey theory and dynamics, Institut Camille Jordan, University of Lyon 1, November 20-24, 2017. Ramsey theory, trees and ultrafilters

The 14th International Workshop in Set Theory, CIRM, Luminy, October 9-13, 2017. The universal triangle-free graph has finite big Ramsey degrees

BLAST 2017, Vanderbilt University, August 14-18, 2017 (plenary).

University of Oxford Mathematical Institute, Analytic Topology Seminar, July 13, 2017.

Association for Symbolic Logic 2017 North American Meeting, Boise, March 20-23, 2017, Special Session in Set Theory and its Applications to Analysis and Topology. The universal triangle-free graeph has finite big Ramsey degrees

2017 Spring Topology and Dynamical Systems Conference, New Jersey City University, March 8-11, 2017, Special Session in Set-Theoretic Topology. Banach spaces from high dimensional Ellentuck spaces

Arctic Set Theory Workshop 3, Kilpisjaervi, Finland, January 25-30, 2017. On the finite big Ramsey degrees for the triangle-free graph: A progress report

Seventh Indian Conference on Logic and its Applications - 2017, Indian Institute of Technology Kanpur, January 5-7, 2017 (plenary). Ramsey Theory on Trees and Applications

RIMS Workshop on Infinite Combinatorics and Forcing Theory, Research Institute for Mathematical Sciences, Kyoto University, Japan, November 28 - December 1, 2016. I gave a tutorial on Ramsey theory in forcing. Tutorial 1 Tutorial 2 Tutorial 3 Expository paper corresponding to Tutorial 3, submitted to RIMS Symposium Proceedings.

Research. I work in Set Theory, Ramsey Theory, Topology, and related areas.

Recently I solved the problem of "big Ramsey degrees for the universal homogeneous triangle-free graph". I am pleased to see the preliminary reviewers' comments for Annals of Mathematics calling this "a remarkable achievment" and "the first major advance towards the Ramsey theory of Fraisse limits that have forbidden configurations", further writing that "Many top names in combinatorics worked on this problem for years, so it can be definitely confirmed that the problem is hard and important." The three preliminary reviewers' comments are posted here. As the assessments were not unanimous, the paper is currently submitted elsewhere. A preprint is available on my Research Page. I am in the process of writing up the extended result for all universal homogeneous k-clique-free graphs. The goal of my approach is to open up a large class of homogeneous structures with forbidden configurations to investigations of their canonical partitions, and connections with topological dynamics via this work of Andy Zucker.

Papers since 2016 published or accepted.

Natasha Dobrinen. "Topological Ramsey spaces dense in forcings." Proceedings of the 2016 SEALS Conference (to appear).

Alvaro Arias, Natasha Dobrinen, Gabriel Giron-Garnica, Jose G. Mijares. "Banach spaces from barriers in high dimensional Ellentuck spaces." Journal of Logic and Analysis (to appear).

Natasha Dobrinen and Daniel Hathaway. "The Halpern-Lauchli Theorem at a measurable cardinal." Journal of Symbolic Logic, 82 (2017), no.4, 1560--1575.

Natasha Dobrinen. "Forcing in Ramsey theory." RIMS Kokyuroku 2042, (2017) 17--33.

Natasha Dobrinen. "Creature forcing and Topological Ramsey spaces." Topology and Its Applications, special issue in honor of Alan Dow's 60th birthday. 213 (2016), 110--126.

Natasha Dobrinen. "Infinite-dimensional Ellentuck spaces and Ramsey-classification theorems." Journal of Mathematical Logic. 16 (2016), no. 1, 1650003, 37pp.

Natasha Dobrinen, Claude Laflamme, and Norbert Sauer. "Rainbow Ramsey simple structures." Discrete Mathematics. 339 (2016), no. 11, 2848--2855.

Natasha Dobrinen, Jose G. Mijares, and Timothy Trujillo. "Topological Ramsey spaces from Fraisse classes, Ramsey-classification theorems, and initial structures in the Tukey types of p-points." Archive for Mathematical Logic, special issue in honor of James E. Baumgartner. 55 (2017), no. 7-8, 733--782.

Jennifer Brown and Natasha Dobrinen. "Spectra of Tukey types of ultrafilters on Boolean algebras." Algebra Universalis. 75 (2016), no. 4, 419--438.

Natasha Dobrinen. "High dimensional Ellentuck space and initial chains in the Tukey structure of non-p-points." Journal of Symbolic Logic, 81 (2016), no.1, 237--263.

Grants and Awards.

My research is currently supported by National Science Foundation Grant DMS-1600781. "Ramsey Theory, Set Theory, and Tukey Order." September 1, 2016 - August 31, 2019. $129,995.

I won the Excellence in Research Award, University of Denver, Division of Natural Sciences and Mathematics, 2015-2016.

See Grants and Awards for the listing of these and previous grants and awards.


In Fall 2018 I am teaching Calculus 1 (MATH 1951) and Set Theory (MATH 3050). In Winter 2019 I will be focusing solely on research. In Spring 2019 I will teach a graduate course in set theory and Perspectives in Art (MATH1150).

Women in Mathematics.

The Mathematics Department at DU now has an AWM Student Chapter. The Faculty Sponsor is Professor Mei Yin and I am the Faculty Co-Sponsor. I also run quarterly mentoring meetings for the women graduate students in math.

Conference Organizing.

Nick Galatos and I (Chair) organized BLAST 2018. This 10-year anniversary conference was held at the University of Denver, August 6-10, 2018.

Dan Hathaway and I organized a special session on Set Theory of the Reals (including Ramsey Theory) at the AMS Western Sectional Meeting at the Unviersity of Denver in October 2016.

The DU Sesquicentennial Ramsey Theory Conference 2014 was held at the University of Denver, May 24 - 28, 2014. The meeting was organized by Jose Mijares and myself. We thank the National Science Foundation and The DU Provost Sesquicentennial Fund for funding to support many participants.

DU is the birthplace of the BLAST Conference Series, which started in 2008 when Professor Nikolaos Galatos and myself co-founded and co-chaired BLAST 08. BLAST stands for Boolean algebras, Logic, Lattices, algebraic Logic, universal Algebra, Set theory, Set-theoretic Topology, point free Topology, and general Topology. These are logic-related areas of interest to researchers at Chapman University; New Mexico State University, Las Cruces; University of Colorado, Boulder; University of Denver; University of Kansas, Lawrence; University of Missouri, Kansas City; University of Nebraska, Omaha; and University of North Texas. The BLAST series is graduate-student friendly and supports participation of graduate students, post-docs, and young researchers with NSF funded travel and lodging support.

Front Range Logic Saturdays (formerly known as the Maximally Informal Gathering or MIG) is a consortium of logicians from the Boulder, Denver, Golden and Fort Collins areas. We gather on selected Saturdays to share research talks, ideas, and lunch. MIG was started in 2009 by Bart Kastermans and myself. FRLS is currently being run by Dan Hathaway and Timothy Trujillo.

I have also organized various special sessions and served on program committees for conferences of the ASL and the AMS. These are listed in my CV.

From 2008 until May 2014, I was the coordinator and supervisor for the Graduate Colloquium which meets on Fridays at 2pm. See Graduate Colloquium for a list of past and present speakers.

Curriculum Vitae (9/13/18)
Present and Past Employment.
Some interesting Links.
last updated September 13, 2018.