He made important contributions to topology , especially to the study of fundamental groups .
Egbert Rudolf van Kampen ( 28 May 1908 , Berchem , Belgium -- 11 February 1942 , Baltimore , Maryland ) was a Dutch mathematician .
Egbert Rudolf van Kampen made important contributions to topology , especially to the study of fundamental groups .
Egbert Rudolf van Kampen ( 28 May 1908 , Berchem , Belgium -- 11 February 1942 , Baltimore , Maryland ) was a Dutch mathematician .