Veroyatno, nevozmozhno v nauke najti bolee zaxvatyvayushhuyu i dramatichnuyu istoriyu, chem istoriya pyatogo postulata Evklida. Ehta zadacha muchila matematikov bolee dvux tysyach let; byla reshena Lobachevskim i Boyai, a zatem sovershenno neozhidanno razvitie ix idej...