Celebratio Mathematica

incollection M. Freedman and R. Kirby: “A geometric proof of Rochlin’s theorem,” pp. 85–97 in Algebraic and geometric topology (Stanford University, CA, August 2–21, 1976), part 2. Edited by R. J. Milgram. Proceedings of Symposia in Pure Mathematics XXXII. American Mathematical Society (Providence, RI), 1978. MR 0520525 Zbl 0392.57018

In 1974 Andrew Casson outlined to us a proof of Rochlin’s Theorem on the index of a smooth, closed 4-manifold \( M^4 \). His proof involved the Arf invariant of a certain quadratic form defined on the first homology group of a surface in \( M^4 \) which is dual to the second Stiefel–Whitney class of \( M^4 \). Our proof was derived from Casson’s; it is the same in principle but differs considerably in detail. After this manuscript was written, we discovered that Rochlin had already in 1971 given a short sketch of this proof; it appears in a paper [Rochlin 1972] about real algebraic curves in \( \mathbb{R}P^2 \).

In addition we obtain a “stable” converse to the Kervaire–Milnor nonimbedding theorem [Kervaire and Milnor 1961], and in Section 2, by relaxing some orientability assumptions, we prove a new (but unspectacular) nonimbedding theorem and find an obstruction to approximating unoriented simplicial 3-chains in a 5-manifold by an immersed 3-manifold.

Richard James Milgram	Related
Robion C. Kirby	Related	Volume

incollection A. Casson and M. Freedman: “Atomic surgery problems,” pp. 181–199 in Four-manifold theory (Durham, NH, July 4–10, 1982). Edited by C. Gordon and R. C. Kirby. Contemporary Mathematics 35. American Mathematical Society (Providence, RI), 1984. MR 0780579 Zbl 0559.57008

Andrew J. Casson	Related
Robion C. Kirby	Related	Volume
Cameron McAllan Gordon	Related	Volume

incollection M. H. Freedman: “\( Z_2 \)-systolic-freedom,” pp. 113–123 in Proceedings of the Kirbyfest (MSRI, Berkeley, CA, June 22–26, 1998). Edited by J. Hass and M. Scharlemann. Geometry & Topology Monographs 2. Mathematical Sciences Publishers, 1999. MR 1734404 Zbl 1024.53029 ArXiv math/0002124

Joel Hass	Related	Volume
Martin Scharlemann	Related	Volume
Robion C. Kirby	Related	Volume

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Michael H. Freedman

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