Ib Holm Sørensen

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Dr Ib Holm Sørensen (1949–2012) was a computer scientist who made contributions to the Z notation and B-Method.[1]

Originally from Denmark, Ib Sørensen started his academic career in the 1970s at Aarhus University, where he worked on the Rikke-Mathilda microassemblers and simulators running on the DECSystem-10 computer.[2]

In 1979, Sørensen joined the Programming Research Group, part of the Oxford University Computing Laboratory (now the Oxford University Department of Computer Science) in England. There he worked with Jean-Raymond Abrial and others, making contributions to the early development of the formal specification language Z. He gained a DPhil degree from the University of Oxford[3] and was a co-author of the seminal Specification Case Studies book on Z, first published in 1987 (second edition in 1993).[4]

From the late 1980s, Sørensen was central in the development of the B-Method, a leading formal method. He left Oxford University to lead a team at BP developing the B-Tool to provide tool support for the B approach. He then founded the company B-Core (UK) Limited[5] to support the B-Toolkit,[6] a set of programming tools designed to support the use of the B-Tool, and undertake B-related projects.

Latterly Sørensen returned to the University of Oxford. From 1999, he worked on the B-based Booster models of requirements. He died in 2012, before he was able to retire.[1]


  1. ^ a b Roscoe, Bill (8 February 2012). "Ib Sorensen – In memoriam". Department of Computer Science, University of Oxford, UK. Retrieved February 22, 2012.
  2. ^ Sørensen, Ib Holm; Kresse, Eric (December 1977). RIKKE-MATHILDA microassemblers and simulators on the DECSystem-10 (PDF). DAIMI MD-28. Aarhus University, Denmark.
  3. ^ Sørensen, Ib Holm (1981). Topics in programme specification and design: specification and design of distributed systems. Wolfson College, University of Oxford, UK.
  4. ^ Hayes, Ian, ed. (1993). Specification Case Studies (PDF) (2nd ed.). Prentice Hall International Series in Computer Science. ISBN 978-0-13-832544-2.
  5. ^ "B-Core (UK) Limited". Company Data Rex. Retrieved February 22, 2012. External link in |publisher= (help)
  6. ^ "The B-Toolkit". B-Core (UK) Limited. Archive.org. 2004. Archived from the original on October 12, 2004. Retrieved February 22, 2012.

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