Speaker:  Niven Achenjang (MIT)

Title:  The descent obstruction

Topics:  Evaluation of torsors; Selmer set; weak Mordell-Weil theorem; descent obstruction.

Reference: Poonen, Rational points on varieties, Sections 8.4.1-8.4.5 and 8.4.7.

________________________________

To access MIT buildings for a math seminar without MIT's CovidPass, you must be invited via a Tim Ticket ahead of time.  There are no exceptions; please make sure to plan accordingly before coming to campus.  To be able to activate the Tim Ticket, the attendee will need to submit an attestation about vaccination and health status and provide contact info.

Finally, a reminder to all in-person participants, MIT covid policies must be adhered to: remember to keep your mask on while inside buildings, eating food is not allowed within lecture rooms, and if you are feeling sick on the day of the talk, please stay home!