Geometry of four dimensions by Michigan Historical Reprint Series

By Michigan Historical Reprint Series

This quantity is made from electronic photos created during the collage of Michigan collage Library's upkeep reformatting software.

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By Michigan Historical Reprint Series

This quantity is made from electronic photos created during the collage of Michigan collage Library's upkeep reformatting software.

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On dit qu'une application f d'un intervalle 1 c R dans un ensemble E est unefonction en escalier s'il existe une partition de 1 en un nombrefini d'intervalles J , telle quef soit constante dans chacun desJ,. Soit (a,),,,,, la suite strictement croissante formée des extrémités distinctes des J,; comme les J, sont deux à deux sans point commun. chacun d'eux est, soit réduit à un point a,, soit un intervalle ayant pour extrémités deux points consécutifs ai, a,+l; en outre, comme 1 est réunion des J,, a, est l'origine, et a, l'extrémité de 1.

FIn + . a + < i < n) sans ambiguïté (exerc. f(n)]. 4) Soit f une fonction vectorielle n fois dérivable dans un intervalle 1 c R. Montrer que pour I/x E 1, on a identiquement (raisonner par récurrence sur n). 5 ) Soient u et v deux fonctions numériques finies n fois dérivables dans un intervalle 1 c R. Si l'on pose Dn(u/u) = ( - l)nwn/vn+len tout point x où v(x) # O, montrer que l'on a (posant w = u/v, dériver n fois la relation u = wu). 6 ) Soit f une fonction vectorielle définie dans un intervalle ouvert 1 c R, prenant ses valeurs dans un espace normé E.

2 O La condition est su$sante.

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