Andrew Obus

Andrew reading math                          

Baruch College
Department of Mathematics
1 Bernard Baruch Way
New York, NY 10010


Office Phone:  646-312-4008
Office: Baruch Vertical Campus 6-223, CUNY Graduate Center 4303
Office Hours Fall 2022: Monday 11:30 - 12:30 (Graduate Center), Monday 2:15 - 3:30 (Baruch), Tuesday 12:00 - 1:00 (Zoom)

About Me: I am an associate professor in the Department of Mathematics at Baruch College, as well as doctoral faculty at the CUNY Graduate Center.  As you can see, I am also an artistic visionary in the field of web design.  My work is partially supported by NSF CAREER Grant DMS-2047638.

Here is my CV.

Research Publications

1. Ramification of primes in fields of moduli of three-point covers, Ph. D. Thesis (2009), supervised by David Harbater at the University of Pennsylvania (vii+135 pp.)
2. (with Rachel Pries) Wild tame-by-cyclic extensions, J. Pure Appl. Algebra, (5) 214 (2010), 565--573
3. Vanishing cycles and wild monodromy, Int. Math. Res. Notices (2012), 299--338
4. Fields of moduli of three-point G-covers with cyclic p-Sylow, I, Algebra Number Theory, 6, (2012) no. 5, 833--883
5. The (local) lifting problem for curves, Proceedings for Conferences in Kyoto "Galois-Teichmüller theory and Arithmetic Geometry"(2012), 359--412
6. Fields of moduli of three-point G-covers with cyclic p-Sylow, II, J. Théor. Nombres Bordeaux 25, (2013) no. 3, 579--633
7. Toward Abhyankar's inertia conjecture for PSL_2(\ell), Proceedings of the Luminy Meeting "Groupes de Galois géométriques et différentiels" (2013), 195--206
8. On Colmez's product formula for periods of CM-abelian varieties, Math. Ann. 356, (2013) no. 2, 401--418
9. Conductors of wild extensions of local fields, especially in mixed characteristic (0, 2), Proc. Amer. Math. Soc. 142 (2014) no. 5, 1485--1495
10. (with Stefan Wewers) Cyclic extensions and the local lifting problem, Ann. of Math. 180, (2014) no. 1, 233--284
11. (with Stefan Wewers) Wild Ramification Kinks, Res. Math. Sci., 3:21 (2016), 27 pp.
12. The local lifting problem for A_4, Algebra Number Theory, 10, (2016) no. 8, 1683--1693
13. Good reduction of three-point Galois covers, Algebraic Geometry, 4, (2017) no. 2, 247--262
14. (with Colin Ingalls, Ekin Ozman, and Bianca Viray) Unramified Brauer Classes on cyclic covers of the projective plane (with an appendix by Hugh Thomas), Proceedings of the AIM Workshop, "Brauer groups and obstruction problems: Moduli and arithmetic" (2017), 115--153
15. A generalization of the Oort conjecture, Comm. Math. Helv., 92, (2017) no. 3, 551--620
16. (with David Harbater, Rachel Pries, and Kate Stevenson) Abhyankar's conjectures in Galois theory: Current status and future questions, Bull. Amer. Math. Soc., 55,  (2018) no. 2, 239--287.
17. (with Hilaf Hasson) The abc conjecture implies the weak diversity conjecture, Albanian J. Math., 12, (2018) no. 1, 8--14
18. (with John Doyle, Holly Krieger, Rachel Pries, Simon Rubinstein-Salzedo, and Lloyd West) Reduction of dynatomic curves, Ergodic Theory Dynam. Systems, 38, (2019) no. 10, 2717--2768
19. Lifting of curves with automorphisms, Open Problems in Arithmetic Algebraic Geometry, Adv. Lect. Math. (ALM) 46, F. Oort, ed. (2019), 9--59
20. (with Stefan Wewers) Explicit resolution of weak wild quotient singularities of arithmetic surfaces, J. Algebraic Geom., 29, (2020) no. 4, 691--728
21. (with Tony Shaska) Superelliptic curves with many automorphisms and CM Jacobians, Math. Comp., 90 (2021), 2951--2975
22. (with Huy Dang, Soumyadip Das, Kostas Karagiannis, and Vaidehee Thatte) Local Oort groups and the isolated differential data criterion (16 pp.), J. Théor. Nombres Bordeaux, 34, (2022) no. 1, 251--269
23. (with Padmavathi Srinivasan) Explicit minimal embedded resolutions of divisors on models of the projective line, Res. Number Theory, 8, (2022), no. 2, Paper No. 27, 27 pp.
24. (with Padmavathi Srinivasan) Conductor-discriminant inequality for hyperelliptic curves in odd residue characteristic (60 pp.), preprint
25. (with Daniele Turchetti) Stabilization indices of potentially Mumford curves (33 pp.), preprint

Other Writings:

1. Preparing for the Tenure-Track Job Market, Notices Amer. Math. Soc., 67, (2020) no. 6, 807--809

Current Teaching (Fall 2022)

MTH 4100 (Linear Algebra and Matrix Methods, Baruch)
MATH 87700 (Introduction to Algebraic Geometry, Graduate Center)

Former Teaching

MTH 4010 (Mathematical Analysis I), Baruch, Spring 2022
MTH 3035 (Vector Calculus), Baruch, Spring 2022
MTH 3006 (Elements of Calculus II), Baruch, Fall 2020
MTH 4000 (Bridge to Higher Mathematics), Baruch, Spring 2020
MTH 4009 (Proof Writing for Mathematical Analysis), Baruch, Spring 2020
MTH 3020/3030 (Multivariable Calculus), Baruch, Fall 2019
MTH 4000 (Bridge to Higher Mathematics), Baruch, Spring 2019

MTH 4500 (Introductory Financial Mathematics), Baruch, Fall 2018

MTH 2205 (Applied Calculus), Baruch, Fall 2018

Math 3315 (Advanced Calculus and Linear Algebra II), Virginia, Spring 2018

Math 3351 (Linear Algebra), Virginia, Spring 2018
Math 2315 (Advanced Calculus and Linear Algebra I), Virginia, Fall 2017

Math 1320 (Calculus II), Virginia, Summer 2016

Math 2310 (Calculus III), Virginia, Spring 2016
Math 8630 (Algebraic Number Theory), Virginia, Spring 2016
Math 4657 (Bilinear Forms and Representation Theory), Virginia, Fall 2015
Math 3351 (Linear Algebra), Virginia, Spring 2015
Math 5658 (Galois Theory), Virginia, Fall 2014

Math 8620 (Algebraic Geometry), Virginia, Fall 2014

Math 7754 (Commutative Algebra), Virginia, Spring 2014
Math 3351 (Linear Algebra), Virginia, Fall 2013

Math V2000 (Intro to Higher Math), Columbia, Spring 2011

Math V2010 (Linear Algebra), Columbia, Spring 2011

Math V1102 (Calculus II), Columbia, Fall 2009

Math 104 (Calculus I), UPenn, Summer 2007

Math 412 (Advanced Linear Algebra), UPenn, Summer 2005


I sit on the board of the I-HELP Liberia Project and am involved in writing the Liberian Math Olympics contests.  I traveled to Liberia in the Summers of 2011, 2013, and 2017 with groups representing the organization to help run two-week STEM teacher training workshops. Since August 2021, I have run a weekly training workshop for Liberian math teachers on Zoom.