# My Birthday

 I did not realise this until today, but I share my birthday with John Wallis (23 November 1616 – 28 October 1703). Wallis made contributions to infinitesimal calculus, analytic geometry, algebra and the theory of colliding bodies. He is best known for the infinity symbol $$\infty$$.

Wallis was also a code breaker and used his mathematical skills during the Civil war to decode Royalist messages for the Parliamentarians.

John Wallis Wikipedia.

## 4 thoughts on “My Birthday”

1. BrainTrainer says:

I dont think I share my birthday (26th October) with anyone.

2. fiveworlds says:

Happy Birthday

3. ajb says:

Just as a remark, I also share a birthday with van der Waals and Moseley.