Dr. Stefan Ovidiu Tohaneanu

Department of Mathematics

University of Idaho

875 Perimeter Drive MS 1103, Moscow, ID 83844-1103

Phone: (208) 885-6234

tohaneanu@uidaho.edu

**Employment**

2019-present: Associate Professor,
University of Idaho

2013-2019: Assistant Professor, University of Idaho

2010-2013: Postdoctoral Fellow and Assistant Professor, The University of Western
Ontario (Advisor Dr.
Graham Denham)

2007-2010: Visiting Assistant Professor, University of Cincinnati

2002-2007: Graduate Teaching Assistant, Texas A&M University

**Education **

Ph.D., Mathematics, Texas A&M University, 2007 (Advisor Dr. Hal Schenck)

M.S., Mathematics (Analysis), University of Bucharest, 2001

M.S., Mathematics (Algebra), University of Bucharest, 1999

B.S., Mathematics, University of Bucharest, 1997

**USEFUL LINKS FOR MATH MAJOR UNDERGRADUATE STUDENTS**

**Teaching **

Students, please check blackboard for detailed information.

Spring 2021: MATH 462: Abstract Algebra II, and MATH 330: Linear Algebra

Fall 2020: MATH 461: Abstract Algebra I, and MATH 430: Advanced Linear Algebra

Spring 2020: MATH 376: Discrete Math II, and MATH 330: Linear Algebra

Fall 2019: MATH 176: Discrete Math I, and MATH 415: Cryptography

Spring 2019: MATH 275: Calculus III, and course coordinator for MATH 175: Calculus II

Fall 2018: MATH 176: Discrete Math I, and MATH 415: Cryptography

Spring 2018: MATH 420: Complex Variables, and MATH 176: Discrete Math I

Fall 2017: MATH 461: Abstract Algebra I, and MATH 415: Cryptography

Spring 2017: MATH 558: Intro to Algebraic Geometry, and MATH 176: Discrete Math I

Fall 2016: MATH 557: Ring Theory, and MATH 330: Linear Algebra.

Summer 2016 – II: MATH 310: Ordinary Differential Equations.

Spring 2016. MATH 330: Linear Algebra, and MATH 556: Groups and Fields II

Fall 2015. MATH 170: Calculus I (entire in-campus course), and MATH 555: Groups and Fields I

Summer 2015. MATH 310 (both sections): Ordinary Differential Equations.

Spring 2015. MATH 310: Ordinary Differential Equations.

Fall 2014. MATH 176: Discrete Math I, and MATH 275: Calculus III.

Spring 2014. MATH 376: Discrete Math II.

Fall 2013. MATH 330: Linear Algebra.

**Research **

My research interest are in Commutative Algebra with applications to
Combinatorics, Discrete Geometry, Algebraic Geometry, Coding Theory or Spline
Approximation. Please click this link for a detailed
CV. Stuff about me and my research can be also found on Google
Scholar and Research
Gate.

This is the list of my publications:

- On the
Jacobian ideal of central arrangements (with R. Burity and A. Simis)

(2021); a version is available at arXiv: 2101.02735.

- Logarithmic
derivations associated to line arrangements (with R. Burity)

*J. Algebra*, to appear (2021); a version is available at arXiv:
2005.14367.

- Ideals
generated by
*a*-fold products of linear forms have linear graded free resolution (with R. Burity and Yu Xie)

(2020), submitted; a version is available at arXiv:
2004.07430.

- On
Geramita-Harbourne-Migliore conjecture (with Yu Xie)

*Trans. Amer. Math. Soc. ***374 **(2021), 4059-4073.

Unpublished; a version is available at arXiv: 1906.02422.

- On the
containment problem for fat points ideals (with Yu Xie)

*Proc. Amer. Math. Soc.* **148 **(2020),
2411-2419.

- GMD
functions for scheme-based linear codes and algebraic invariants of
Geramita ideals (with S. Cooper, A. Seceleanu, M. Vaz Pinto and R.
Villarreal)

*Advances in Applied Math.* **112 **(2020), 101940.

*J. Commutative Algebra*, to appear (2020); a version
is available at arXiv: 1807.08021.

- Equivalent
matrices up to permutations (with Jesus Vargas)

Unpublished; a version is available at arXiv: 1805.08343.

(2020), submitted; a version is available at arXiv:
1707.07091. Extended abstract published in *Oberwolfach Reports ***5 **(2021)
59-61, DOI: 10.4171/OWR/2021/5.

- A blowup
algebra for hyperplane arrangements (with M. Garrousian and A. Simis)

*Algebra & Number Theory ***12
**(2018)*, *1401-1429.

*Mathematische Nachrichten ***290
**(2017),
3029-3037.

- Generalized
star configurations and the Tutte polynomial (with B. Anzis and M.
Garrousian)

*J. Algebraic Combinatorics* **42 **(2017), 165-187.

*J. Combinatorial Theory,
Series A* **140** (2016), 76-96.

- On
a conjecture of Vasconcelos via Sylvester forms (with R. Burity and A.
Simis)

*J. Symbolic Computation* **77 **(2016), 39-62.

*Discrete Mathematics* **339 **(2016), 54-61.

*Archiv der Mathematik* **105 **(2015), 343-349.

- Minimum
distance of linear codes and the \alpha-invariant (with M. Garrousian)

*Advances in Applied Math.* **71 **(2015), 190-207.

- Error-correction
of linear codes via colon ideals (with B. Anzis)

*J. Algebra (C.S.)* **443 **(2015), 479-493.

- The ubiquity
of Sylvester forms in almost complete intersections (with A. Simis)

*Collectanea Math.* **66 **(2015), 1-31.

*J. Algebra* **400** (2014),
72-77.

- Modular decomposition of the
Orlik-Terao algebra of a hyperplane arrangement (with G. Denham and M.
Garrousian)

*Annals of Combinatorics***18**(2014), 289-312. - Homology of homogeneous divisors
(with A. Simis)

*Israel J. Math.***200**(2014), 449-487. - A commutative algebraic approach to
the fitting problem

*Proc. Amer. Math. Soc.***142**(2014), 659-666. - A computational criterion for the
supersolvability of line arrangements

*Ars Combinatoria***117**(2014), 217-223. - From Splines Approximation to Roth's
Equation and Schur Functors (with J. Minac)

*Manuscripta Math.***142**(1) (2013), 101-126. - On freeness of divisors on P^2

*Communications in Algebra***41**(8) (2013), 2916-2932. - Growth of the ideal generated by a
quadratic multivariate function over GF(3) (with T. Hodges, J. Ding,
V. Kruglov, D. Schmidt)

*J. Algebra Appl.***12**(2013), 1250219-1 to 23. - Bounding invariants of fat points using
a Coding Theory construction (with A. Van Tuyl)

*J. Pure Appl. Algebra***217**(2013), 269-279. - The
minimum distance of sets of points and the minimum socle degree

*J. Pure Appl. Algebra***215**(2011), 2645-2651. - On
the De Boer-Pellikaan method for computing minimum distance

*J. Symbolic Computation***45**(2010), 965-974. - Lower bounds
on minimal distance of evaluation codes

*Appl. Algebra Eng. Commun. Comput.***20**(5-6)(2009), 351-360. - The Orlik-Terao algebra and
2-formality (with H. Schenck)

*Math. Res. Lett.***16**(1)(2009), 171-182. - Freeness of Conic-Line Arrangements
in P^2 (with H. Schenck)

*Commentarii Mathematici Helvetici***84**(2009) 235-258. - Mutant Grobner basis algorithm (with J. Ding, D.
Cabarcas, D. Schmidt and J. Buchmann)

Proceedings of the 1st international conference on Symbolic Computation and Cryptography, Beijing, LMIB, pp. 16-22 (2008). - Topological criteria for k-formal
arrangements

*Beitrage zur Algebra und Geometrie***48**(1)(2007), 27-34. - Smooth planar r-splines of degree
2r

*J. Approx. Theory***132**(2005), 72-76.