Edsger Wybe Dijkstra (] ; 11 May 1930 – 6 August 2002) was a Dutch computer scientist and an early pioneer in many research areas of computing science who held the Schlumberger Centennial Chair in Computer Sciences at the University of Texas at Austin from 1984 until his retirement in 1999, he was a professor of mathematics (1962–1984), at which university of technology located in Eindhoven, Netherlands?