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- W2139546268 abstract "Exact sequences, which were subsequently used for calculating the group ℰ( X ) of homotopy classes of self-homotopy equivalences of a space X , were given by Barcus and Barratt (§5 of ( 1 )) in the case where X is obtained from a simply-connected ( q + 1 > 1)-dimensional complex by adding one ( q + l)-cell ( q ≥ 3): these were later extended by Kudo and Tsuchida (theorems 2·2 and 2·8 of ( 6 )) and by the author (theorem 3·1* of ( 15 )), who also obtained a related sequence (theorem 2·3* of ( 15 )). In the case of a two-cell complex, one or more of these sequences has been shown to split by Oka, Sawashita and Sugawara (theorems 3·9, 3·13 and 3·15 of (11)). The sequences have been used to calculate ℰ (X) for a number of complexes having two, three or more cells by various authors, including Oka ( 8 ), Oka, Sawashita and Sugawara ( 11 ), Rutter ( 17 ) and Sawashita ( 18 ). However the aforementioned sequences are only applicable to the addition of top-dimensional cells if the complex has no cells in its penultimate dimension. In this article I obtain sequences which are applicable without this latter restriction, show that one of them is generally split, and in special cases where there is only one top-dimensional cell obtain a further splitting: sequences are given which are valid without the assumption that A is simply connected. Also I give a new formula for calculating ℰ (X) in the case where X is not 2-connected." @default.
- W2139546268 created "2016-06-24" @default.
- W2139546268 creator A5019355201 @default.
- W2139546268 date "1983-03-01" @default.
- W2139546268 modified "2023-09-27" @default.
- W2139546268 title "The group of homotopy self-equivalence classes of CW complexes" @default.
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- W2139546268 doi "https://doi.org/10.1017/s0305004100060576" @default.
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