# Welcome

## Coordinates:

School of Mathematical Sciences

University of Northern Colorado

Greeley, CO 80639

**Office:** Ross 2239-G

**Phone:** 970-351-2380

**Email:** oscar.levin@unco.edu

## Discrete Textbook

Discrete Mathematics: An Open Introduction is now available to download for free or purchase for cheap. More information about this open source textbook can be found by clicking the link above.

## Teaching:

This Spring (2016) I am teaching Supplemental Calculus (Math 130), Discrete Mathematics (Math 228) and Abstrac Algebra II (Math 322). Course materials will be available through Blackboard.

I have begun recording videos in which I work out some example problems. These can be seen on my YouTube channel: Mathematics Exemplified.

Since arriving at UNC, I taught Discrete Mathematics, Modern Geometry I, Abstract Algebra I and II, Calculus I and II and Topics in Calculus, as well as graduate courses in Logic, Graph Theory, Analysis, and Probability and Statistics. I have taught a wide variety of courses at Coastal Carolina University and the University of Connecticut as well. Course websites for most of those classes are available here.

## Research

My primary interests lie in effective algebra and combinatorics, computability theory, reverse mathematics, and mathematical logic. Effective algebra endeavors to understand results of algebra and combinatorics from a viewpoint of computability theory. My Ph.D. dissertation concerns the effective content of ordered fields. My thesis, along with some other papers I've worked on, are available on my research page

## Mathematical Puzzles

I enjoy using mathematical puzzles in teaching. I have started a collection of the best of these puzzles on what I'm calling the Math Puzzle Wiki. If you are a math teacher looking for a good extra credit problem, or simply a puzzle enthusiast, please check it out. You can even contribute your own puzzles or add to ones already there.