<prompt> Nyora kupfuurira kweiyi ndima - Pashure pokupinda kweWarsaw Pact muna 1968 muCzechoslovakia  <response>: , haana kunyatsogamuchirwa nemaoko maviri. Saka muna 1971, akaenda kuOttawa, Canada, kwaakatanga dhipatimendi remasvomhu anowanika paCarlton University iro rakachinja zvikuru mashandiro anoita algebra, probability, uye nhamba. 