<prompt> Qedela umusho olandelayo: Ngemva kuka - 1968  <response>: Lapho iWarsaw Pact ihlasela iCzechoslovakia, akazange amukelwe ngezandla ezivulekile. Ngakho ngo-1971, wathuthela e-Ottawa, eCanada, lapho asungula khona futhi wahola khona umnyango wezibalo zesimanje eCarleton University oye waba nethonya elikhulu ezweni le-algebra, amathuba, nezibalo. 