# Princeton Discrete Math Seminar

## Title:

A Problem from Quantum Logic

## Speaker:

- Derek Smith
- Princeton University

## Place:

- Fine Hall 214
- Princeton University

## Time:

- 3:00 p.m.
- Thursday, April 24, 1997

Abstract:
Let S be a finite set of lines through the origin in R^3.
Whenever two lines in S are orthogonal, augment S with the line
orthogonal to both of them. Can the size of S increase without
bound?

We'll discuss this problem and its generalizations, naturally
considering factorization in the integral quaternions and octonions
along the way.

Next week: Laszlo Lovasz (Wednesday) and Doron Zeilberger (Thursday)

Document last modified on April 22, 19997