Jean-Yves Girard
| Jean-Yves Girard | |
|---|---|
| Born | 1947 (age 69–70) Lyon |
| Nationality | French |
| Fields | Mathematics |
| Institutions | CNRS |
| Alma mater |
École normale supérieure de Saint-Cloud Paris Diderot University |
| Doctoral advisor | Jean-Louis Krivine |
| Doctoral students |
George Koletsos Yves Lafont Laurent Regnier |
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.
He obtained the CNRS Silver medal in 1983 and is a member of the French Academy of Sciences.
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