I am a Professor in the
Department of Mathematics
at University of Michigan.
Here is my
contact information.
My work is in algebraic geometry. Over the past few years I have been involved in a long-term project with Mihnea Popa, studying certain invariants of hypersurface singularities (Hodge ideals) that arise naturally from Saito's theory of mixed Hodge modules. I am interested in general in invariants of singularities of algebraic varieties, such as minimal log discrepancies, log canonical thresholds, multiplier ideals, Bernstein-Sato polynomials, and F-thresholds. Various points of view and techniques come in the picture when studying these invariants: resolutions of singularities, jet schemes, D-modules or positive characteristic methods. Here is my CV, including a list of publications. ## PapersYou can find here my papers on the archive. Here are a few recent ones: |

1. Hodge filtration on local cohomology, Du Bois complex, and local cohomological dimension (with Mihnea Popa), available at arXiv:2108.05192.

2. The Du Bois complex of a hypersurface and the minimal exponent (with Sebastián Olano, Mihnea Popa, and Jakub Witaszek), available at arXiv:2105.01245.

3. Minimal exponents of hyperplane sections: a conjecture of Teissier (with Bradley Dirks), available at arXiv:2008.10345.

4. On a conjecture of Teissier: the case of log canonical thresholds (with Eva Elduque), available at arXiv:2005.03803.

5. The Hilbert series of Hodge ideals of hyperplane arrangements (with Bradley Dirks), available at arXiv:2003.11681.

6. Upper bounds for roots of B-functions, following Kashiwara and Lichtin (with Bradley Dirks), available at arXiv:2003.03842.

7. Hodge ideals and minimal exponents of ideals (with Mihnea Popa), available at arXiv:1912.08072.

8. Bernstein-Sato polynomials for general ideals vs. principal ideals, availableat arXiv:1906.03086.

9. An invariant detecting rational singularities via the log canonical threshold (with Raf Cluckers), available at arXiv:1901.08111.

10. Hodge filtration, minimal exponent, and local vanishing (with Mihnea Popa), available at arXiv:1901.05780.

11. Igusa's conjecture for exponential sums: optimal estimates for non-rational singularities (with Raf Cluckers and Kien Huu Nguyen), available at arXiv:1810.11340.

Winter 2022. Math 732. Introduction to singularities.

Fall 2021. Math 412. Introduction to modern algebra (Section 001).

Fall 2020. Math 217. Linear algenra (Section 014) and Math 565. Combinatorics and graph theory.

Fall 2019. Math 731. Introduction to Hodge theory and Math 420. Advanced linear algebra.

Winter 2018. Math 632. Algebraic geometry II.

Fall 2017. Math 631. Algebraic geometry I.

Winter 2017. Math 732. Rationality of algebraic varieties. Here are some notes that Takumi Murayama Live TeX-ed during lectures. For most of the course I also posted lecture notes here.

Fall 2016. Math 593. Algebra I.

Fall 2015. Math 565. Combinatorics and graph theory and Math. 412. Introduction to modern algebra.

Winter 2015. Math 412. Introduction to modern algebra.

Fall 2014. Math 711. Topics in birational geometry.

Winter 2014. Math 537. Introduction to differential topology.

Fall 2013. Math 731. Spaces of arcs and singularities in birational geometry.

Winter 2013. Math 732. Introduction to birational geometry.

Winter 2012. Math 732. Introduction to diophantine approximation on abelian varieties. Mitya Boyarchenko kindly posted scanned versions of his notes here.

Winter 2011. Math 732. Zeta functions in algebraic geometry. Here are the lecture notes from the course.

Winter 2010. Math 632. Algebraic geometry II.

Fall 2009. Math 631. Algebraic geometry I.

Fall 2007. Math 631. Algebraic geometry I.

Winter 2006. Math 632. Algebraic geometry II (Schemes and cohomology). Here are the homework assignments and the problems covered in the discussion session.

Fall 2004, Winter 2005. Math 731 and 732. Topics in Algebraic Geometry I and II (Toric varieties). Here are the lecture notes, though some chapters are still missing. The first chapters are just expanded versions of the corresponding chapters in Bill Fulton's book "Introduction to toric varieties", using also Bill's lecture notes for a course he taught a few years ago.

2. I was one of the organizers of the Spring 2019 MSRI program Algebraic geometry and moduli spaces. At the same time, there was a program in Derived algebraic geometry.

3. Daniel Erman, Claudiu Raicu, Greg Smith, and I organized the conference “A view towards algebraic geometry“, on the occasion of David Eisenbud's 70th birthday. This was held at the Harbor View Hotel on Martha’s Vineyard, between May 1-5, 2017.

4. Tommaso de Fernex, Karl Schwede, and I organized the Summer school and conference Higher dimensional algebraic geometry, held at the University of Utah, July 18-26, 2016.

5. Tommaso de Fernex, Brendan Hassett, Martin Olsson, Mihnea Popa, Richard Thomas, and I organized a successor to Seattle 2005 (and Santa Cruz 1995, Bowdoin 1985, Arcata 1974, Woods Hole 1964). This took place between July 13-31, 2015, at the University of Utah.

1. Between July 30-August 5, we will have the Derived categories, moduli spaces, and hyperkähler varieties conference.

2. D-modules: applications to Algebraic Geometry, Arithmetic, and Mirror Symmetry, Luminy, April 11-15, 2022.

3. MPS conference on Higher Dimensional Geometry at Simons Foundation, New York, February 23-25, 2022.

4. Faces of Singularity Theory, Luminy, November 22-26, 2021.

5. Virtual workshop D-modules, Group Actions, and Frobenius: Computing on Singularities, ICERM, August 9-13, 2021.