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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

 

Note on sequences of Mayer-Vietoris type


Authors: Eldon Dyer and Joseph Roitberg
Journal: Proc. Amer. Math. Soc. 80 (1980), 660-662
MSC: Primary 55P99
MathSciNet review: 587950
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Abstract: In this largely expository note, we reexamine the construction of the homotopical Mayer-Vietoris sequence associated to a homotopy pullback. We show that in this situation, the Mayer-Vietoris sequence may be realized simply as the homotopy sequence of a suitable fibration. The usual approaches to constructing the Mayer-Vietoris sequence involve some auxiliary algebraic result, such as the Barratt-Whitehead lemma; the present approach avoids any such considerations. An additional beneficial feature of our approach is the attention paid to the bottom end of the Mayer-Vietoris sequence. Thus we are led to a cleaner proof of Proposition II.7.11 of [HMR]; moreover, we show that the converse of this latter result is also true.

The homological Mayer-Vietoris sequence associated to a homotopy pushout may be established in a very similar manner, as we point out at the end of the paper.


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DOI: http://dx.doi.org/10.1090/S0002-9939-1980-0587950-8
PII: S 0002-9939(1980)0587950-8
Article copyright: © Copyright 1980 American Mathematical Society