BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:CANCELLED   -  Undecidability in number theory - Bjorn Poonen\, MI
 T
DTSTART:20200427T110000Z
DTEND:20200427T120000Z
UID:TALK128335@talks.cam.ac.uk
CONTACT:Ivan Smith
DESCRIPTION:Hilbert's tenth problem asked for an algorithm that\, given a\
 nmultivariable polynomial equation with integer coefficients\, would\ndeci
 de whether there exists a solution in integers.  Around 1970\,\nMatiyasevi
 ch\, building on earlier work of Davis\, Putnam\, and Robinson\,\nshowed t
 hat no such algorithm exists.  But the answer to the analogous\nquestion w
 ith integers replaced by rational numbers is still unknown\,\nand there is
  not even agreement among experts as to what the answer\nshould be.
LOCATION:Room 3\, Mill Lane Lecture Rooms\, 8 Mill Lane\, Cambridge
END:VEVENT
END:VCALENDAR