- Happy Birthday Ervin, János, Péter, and Zoli!
- My Mathematical Dialogue with Jürgen Eckhoff
- Test Your Intuition (23): How Many Women?
- Happy Birthday Richard Stanley!
- Influence, Threshold, and Noise
- Erdős Lectures 2014 – Dan Spielman
- Answer to Test Your Intuition (22)
- Test your intuition (22): Selling Two Items in a Bundle.
Top Posts & Pages
- The Kadison-Singer Conjecture has beed Proved by Adam Marcus, Dan Spielman, and Nikhil Srivastava
- Why Quantum Computers Cannot Work: The Movie!
- Polymath 8 - a Success!
- Believing that the Earth is Round When it Matters
- Emmanuel Abbe: Erdal Arıkan's Polar Codes
- Navier-Stokes Fluid Computers
- Analysis of Boolean Functions
- Another Forgotten Bet: Is Don Zagier About to Owe Me 1000 Shekels For The Proof of the ABC Conjecture?
Tag Archives: Ramanujan graphs
Margulis’ paper Ramanujan graphs were constructed independently by Margulis and by Lubotzky, Philips and Sarnak (who also coined the name). The picture above shows Margulis’ paper where the graphs are defined and their girth is studied. (I will come back to the question … Continue reading