Erdős Numbers

From wikipedia.org:

"The mathematician Paul Erdős wrote around 1500 mathematical articles in his lifetime, mostly co-written. He had 509 direct collaborators; these are the people with Erdős number 1. The people who have collaborated with them (but not with Erdős himself) have an Erdős number of 2 (6,984 people). " And so on.

My Erdős number is 4 as I am linked to Erdős via the following chain of coauthors:

I worked with Krzysztof Burdzy, who worked with Davar Khoshnevisan, who worked with Endre Csaki, who worked with Paul Erdős.

Which just goes to show that the world is really small in some ways.

David Frankel