Jean-Yves Girard

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Jean-Yves Girard
Born 1947 (age 70–71)
Nationality French
Alma mater École normale supérieure de Saint-Cloud
Paris Diderot University
Scientific career
Fields Mathematics
Institutions CNRS
Doctoral advisor Jean-Louis Krivine (fr)

Jean-Yves Girard (French: [ʒiʁaʁ]; born 1947) is a French logician working in proof theory. He is the research director (emeritus) at the mathematical institute of Luminy.


Jean-Yves Girard is an alumnus of the École normale supérieure de Saint-Cloud.

He made a name for himself in the 1970s with his proof of strong normalization in a system of second-order logic called System F. This result gave a new proof of Takeuti's conjecture, which was proven a few years earlier by William W. Tait, Moto-o Takahashi and Dag Prawitz. For this purpose, he introduced the notion of "reducibility candidate" ("candidat de réducibilité"). He is also credited with the discovery of Girard's paradox, linear logic; the geometry of interaction; ludics; and the mustard watch.[1]

He obtained the CNRS Silver medal in 1983 and is a member of the French Academy of Sciences.



  1. ^ Ringard, Yann-Joachim (1990). "Mustard watches: an integrated approach to time and food". Retrieved 27 May 2018. 

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