Zvonimir Janko

Zvonimir Janko ( born July 26, 1932 in Zagreb) is a Croatian mathematician, known as the discoverer of the Janko groups, a series of sporadic finite simple groups.

Life and work

Janko studied at the University of Zagreb and received his doctorate in 1960 with the theme " non- degenerate skew Redeische products " with Vladimir Devide. He is currently a professor at the Ruprecht -Karls- University of Heidelberg.

Janko discovered his first sporadic simple group in 1964, when he was (J1 called ) at the Australian National University in Canberra. This was followed by J2 and J3 in 1966 (J3 with Graham Higman and McKay, J2 with Marshall Hall ) and J4 with Simon Norton and Parker 1975 J4 1975 was the last sporadic simple group that was discovered -. , And after Klassifikationstheorem there no further. Janko sporadic group J1 was the first that was found after the Mathieu groups in the 19th century and led to an intensive search for other groups which then with the discovery of Monsters by Robert Griess and Bernd Fischer in 1974 and Janko's discovery of J4 1975 was completed.

In 1970 he was invited speaker at the International Congress of Mathematicians in Nice ( A class of non- solvable finite groups).