# Roger F. House

This website reflects my interests in computer programming and mathematics.

## Resumé and related stuff

## Programming

How to make a program run 80 times faster

C - Sudoku solver

C++ - Bird population simulator

Java and C++ - Yosokumo data
mining web service APIs

## Mathematical Articles

Why is e^{iπ} = -1?

Solution to a problem posed by Erdös

Notes on the Graph Isomorphism
Problem

Convex Hull Algorithms in
the Plane

## Miscellaneous Talks

A 4-Dimensional Graph Has at Least 9 Edges

Video of 'A 4-Dimensional Graph Has at Least 9 Edges'

## Scientific Cafe Talks

Mathematical Structures: Groups, Rings, and Fields

Numbers: Real, Imaginary, Complex, and Beyond ...

Video of 'Numbers: Real, Imaginary, Complex, and Beyond ...'

Graph Theory: Solved and Unsolved Problems

A 4-Dimensional Graph Has at Least 9 Edges

How Big Is Infinity? Some Mathematical Surprises

A Short History of Equations: "x is almost always 11"

The Mathematics of Map Coloring: The Four-Color Theorem

The Mathematics of Map Coloring: The Four-Color Theorem - Short Version

## Miscellaneous

Computerized Braille
Translation and Production in Sweden