*Monday 18th February*–

*Monday 18th February 2019*

Join us on Monday 18 February, 6pm, SM2 for the first of this terms Matrix talks, designed to show off bits of maths that you won’t see in lectures – no special knowledge required!

**Title: Password hacking, the de Bruijn way – Dan Fretwell**

Abstract: How does one brute force a password of length n? You try all the possibilities of course*.

But what if the machine lets you type **until** the correct password is entered? Then you can do much better…by using de Bruijn sequences**!

Intrigued? Then come along. There might even be magic***…

(* not recommended)

(** also not recommended, but is definitely better…honest)

(*** a poor attempt at, but probably worth coming for just in case I mess it up)

**Title: The Circles of Apollonius – Nick Rome**

Abstract: Over 2000 years ago, the Greek mathematician Apollonius of Perga described how given three touching circles you can construct two more that touch each of the original circles. This neat construction is still studied today leading to all sorts of interesting questions in geometry, fractals, group theory and number theory.

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