Titlebook: Elements of Homotopy Theory; George W. Whitehead Textbook 1978 The Editor(s) (if applicable) and The Author(s), under exclusive license to

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寬敞

https://doi.org/10.1007/978-1-4612-6318-0Base; Calc; Characteristic class; Elements; Excision theorem; Fundamental group; Homotopie; Homotopy; Homoto

遍及

感情脆弱

Concomitant

GRAIN

Fecundity

Constant

有機(jī)體

Law and Business: Comparative Perspectivess which are connected by an exact triangle. Such a diagram is called an exact couple; the notion is due to Massey [1; 2]. The basic operation on exact couples, that of ., gives rise to a new exact couple. Hence the process can be iterated to obtain an infinite sequence of diagrams.

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