Halperin conjecture

Short description: Mathematical conjecture

In rational homotopy theory, the Halperin conjecture concerns the Serre spectral sequence of certain fibrations. It is named after the Canadian mathematician Stephen Halperin.

## Contents

* 1 Statement
* 2 Status
* 3 Notes
* 4 References

## Statement

Suppose that F->E->B is a fibration of simply connected spaces such that F is rationally elliptic and χ(F)≠0 (i.e., F has non-zero Euler characteristic), then the Serre spectral sequence associated to the fibration collapses at the E2 page.[1]

## Status

As of 2019, Halperin's conjecture is still open. Gregory Lupton has reformulated the conjecture in terms of formality relations.[2]

## Notes

1. ↑ Berglund
2. ↑ Lupton

## References

* Berglund, Alexander (2012), Rational homotopy theory, http://staff.math.su.se/alexb/rathom2.pdf
* Félix, Yves; Halperin, Stephen; Thomas, Jean-Claude (1993), "Elliptic spaces II", L'Enseignement Mathématique, doi:10.5169/seals-60412
* Félix, Yves; Halperin, Stephen; Thomas, Jean-Claude (2001), Rational Homotopy Theory, New York: Springer Nature, doi:10.1007/978-1-4613-0105-9, ISBN 0-387-95068-0
* Félix, Yves; Halperin, Stephen; Thomas, Jean-Claude (2015), Rational Homotopy Theory II, Singapore: World Scientific, doi:10.1142/9473, ISBN 978-981-4651-42-4
* Félix, Yves; Oprea, John; Tanré, Daniel (2008), Algebraic Models in Geometry, Oxford: Oxford University Press, ISBN 978-0-19-920651-3
* Rational Homotopy Theory and Differential Forms, Boston: Birkhäuser, 1981, ISBN 3-7643-3041-4
* James, Ioan M., ed. (1999), "A history of rational homotopy theory", History of Topology, Amsterdam: North-Holland, pp. 757–796, doi:10.1016/B978-044482375-5/50028-6, ISBN 0-444-82375-1
* "Rational homotopy theory: a brief introduction", Interactions between Homotopy Theory and Algebra, Contemporary Mathematics, 436, American Mathematical Society, 2007, pp. 175–202, doi:10.1090/conm/436/08409, ISBN 9780821838143, http://www.math.uic.edu/~bshipley/hess_ratlhtpy.pdf
* Lupton, Gregory (1997), "Variations on a conjecture of Halperin", Homotopy and Geometry (Warsaw, 1997)

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