Abstract
We will give a very elementary introduction to reciprocity laws ( of which the Langlands programme is a vast generalisation). Starting with the definition of the field Q_p of padic numbers, we will prove that the Galois group G of the compositum M of all quadratic extensions of Q_p is canonically isomorphic to the multiplicative group modulo squares. We also give an explicit formula for the quadratic Hilbert symbol, which gives the action of G on M.
The talks will be accessible to a very wide audience and will be adapted to the background and the interests of the audience..
Information:
Date and Time:  Tuesdays, September 15, and 29, 2015 at 10:3012:00 and 14:0015:30 and Wednesday September 30, 2015 at 15:3018:00
 Place:  Niavaran Bldg., Niavaran Square, Tehran, Iran 
