Changho Han

**About me**:
I am a Postdoctoral Fellow at the University of Waterloo.
My research is primarily in algebraic geometry. In particular, I am mainly interested in geometric and arithmetic properties of moduli spaces, and also interested in enumerative problems. See my
research statement for more details on my mathematical interests.

I got PhD degree in Mathematics at Harvard University. My graduate advisor is Joe Harris.

I was a Limited-Term Assistant Professor at the University of Georgia.

Here is my CV.

- Arithmetic secant formulae for linear series on hyperelliptic curves, with Ethan Cotterill and Naizhen Zhang.

(in preparation). - Counting points on $x^2+y^2 = z^4$ and 5-isogenies of elliptic curves over $\mathbb{Q}$, with Santiago Arango-Pi˜neros, Oana Padurariu, and Sun Woo Park.

(in preparation). - Stable quadrics, admissible covers, and Kondo’s sextic K3 surfaces, with Anand Deopurkar.

(in preparation). - Arithmetic inflection of superelliptic curves,
with Ethan Cotterill, Ignacio Darago, Cristhian Garay López,
and Tony Shaska.

Under revision at Michigan Mathematical Journal. pdf, arXiv - Compact moduli of K3 surfaces with a nonsymplectic automorphism, with Valery Alexeev and Philip Engel.

To appear at Transactions of the American Mathematical Society pdf, arXiv - Arithmetic inflection formulae for linear series on hyperelliptic curves,
with Ethan Cotterill and Ignacio Darago.

Mathematische Nachrichten,**00**(2023). pp. 1-29. Online, pdf, arXiv - Enumerating odd-degree hyperelliptic curves and abelian surfaces over $\mathbb{P}^1$, with June Park.

Mathematische Zeitschrift,**304**(2023). Article no. 5. Online, pdf, arXiv - Stable log surfaces, admissible covers, and canonical curves of genus 4, with Anand Deopurkar.

Transactions of the American Mathematical Society,**374**(2021). no. 1, pp. 589-641. Online, pdf, arXiv, Thesis - Arithmetic of the moduli of semistable elliptic surfaces, with June Park.

Mathematische Annalen,**375**(2019). pp 1745-1760. Online, pdf, arXiv

I have taught the following at the University of Waterloo:

- Amath/Pmath 331, as an instructor (Applied Real Analysis), Fall 2023
- Amath/Pmath 332, as an instructor (Applied Complex Analysis), Winter 2023
- Math 127, as an instructor (Calculus 1 for the Sciences), Fall 2022

I have taught the following at the University of Georgia:

- Math 2700, as an instructor (Elementary Differential Equations), Spring 2022
- Math 2250, as an instructor (Calculus I), Fall 2021
- Math 2700, as an instructor (Elementary Differential Equations), Spring 2021
- Math 2250, as an instructor (Calculus I), Fall 2020
- Math 2250, as an instructor (Calculus I), Spring 2020
- Math 1113, as an instructor (precalculus), Fall 2019

I have taught the following courses at Harvard:

- Math 1b, as a coaching fellow (integration, series and differential equations) and as a teaching fellow, Spring 2019
- Math 1b, as a teaching fellow (integration, series and differential equations), Fall 2017
- Math 21b, as a teaching fellow (linear algebra and differential equations), Spring 2017
- Math 258Y, as a course assistant (graduate topics course on degenerations in algebraic geometry), Fall 2016
- Math 1b, as a teaching fellow (integration, series and differential equations), Fall 2015