Bronisław Knaster Bronisław Knaster ( 1893 – 1990 ) was a Polish mathematician ; from 1939 university professor at Lwów , from 1945 at Wrocław . Knaster received his Ph.D. degree from Université de Paris in 1925 , under the supervision of Stefan Mazurkiewicz . These two individuals are considered by many among the greatest point-set topologists of all time . He worked in topology and set theory . He is perhaps best known for his discovery of the pseudo-arc , the first example of a hereditarily indecomposable continuum , and the Knaster continuum , or buckethandle continuum . In 1963 he received a Nagroda państwowa ( national award ) and a degree . He was famous for his sense of humour . He organized meetings of mathematicians called knasteria after the history of this discipline in Poland . See also Knaster-Tarski theorem This article about a Polish mathematician is a stub . You can help Wikipedia by expanding it . Categories : European mathematician stubs | 1893 births | 1990 deaths | 20th century mathematicians | Polish mathematicians | Topologists In other languages : Polski 