全新正版 急速发货
¥ 86 8.7折 ¥ 99 全新
库存8件
作者(法)菲利克斯 著
出版社世界图书出版公司
ISBN9787510058349
出版时间2013-03
装帧平装
开本其他
定价99元
货号23301844
上书时间2024-11-18
R,ational homotopy theory has the disadvantage of discarding aconsiderable amount of information. For example, the homotopygroups of the sphere S'2 are non-zero in infinitelv many degreeswhereas its rational homotopy groups vanish in all degrees above 3.By contrast, rational homotopy theory has the advantage of beingremarkably computational. For example, there is not even aconjectural de*ion of all the homotopy groups of any simplyconnect.ed finite CW complex, whereas for many of these therational groups can be explicitly determined. And whilerational homotopy theory is indeed simpler than ordinary homotopytheory, it is exactly this simplicity that makes it possible toaddress (if not alway-s to solve) a number of fundamentalquestions.
R,ational homotopy theory has the disadvantage of discarding a
considerable amount of information. For example, the homotopy
groups of the sphere S'2 are non-zero in infinitelv many degrees
whereas its rational homotopy groups vanish in all degrees above 3.
By contrast, rational homotopy theory has the advantage of being
remarkably computational. For example, there is not even a
conjectural de*ion of all the homotopy groups of any simply
connect.ed finite CW complex, whereas for many of these the
rational groups can be explicitly determined. And while
rational homotopy theory is indeed simpler than ordinary homotopy
theory, it is exactly this simplicity that makes it possible to
address (if not alway-s to solve) a number of fundamental
questions.
— 没有更多了 —
以下为对购买帮助不大的评价