Hélène Eynard

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Let f be a smooth diffeomorphism of the closed half-line R+ with a single fixed point at the origin. In this article, we study the centralizer of f in the group Dr of Cr diffeomorphisms of R+, 1 ≤ r ≤ ∞, that is, the (closed) subgroup Zr f of Dr made up of all diffeomorphisms commuting with f . The first things to observe are that Zr decreases with r,(More)
74 colic perforations were surgically handled between 1975 and 1988. Among the non-traumatic perforations, which represent 74% of this series, 39 cases (71%) complicated the course of acute diverticulitis, 9 cases (15%) were due to cancers and 7 cases (13%) were of miscellaneous origin. Traumatic perforations (26%) were iatrogenically induced in 84% (16(More)
63 colonic occlusions were operated on from 1975 to 1988. Cancer and stenotic diverticular sigmoiditis were found to be the main causes of colonic obstruction in respectively 36 cases (55%) and 8 cases (13%). Other etiologies were represented by neoplasic gynecologic diseases (9.5%). The rectosigmoid was involved in 50% of the cases (31) while transverse(More)
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