## Canonical framings for 3-manifolds.(English)Zbl 0947.57020

This is a relatively self-contained exposition of framings, stable framings and 2-framings for a smooth, closed oriented 3-manifold $$M$$. The authors state that their principal objective is to define the notion of a canonical (stable) framing within each spin structure on $$M$$. This is done by minimizing a “Hirzebruch defect” and/or “degree” associated with the appropriate class of framings. They calculate the difference between a naturally occuring framing and the canonical one for quotients of $$S^3$$ by finite subgroups and for manifolds occuring as the boundary of a simply connected spin 4-manifold. See also [M. Atiyah, Topology 29, No. 1, 1-7 (1990; Zbl 0716.57011); D. S. Freed and R. E. Gompf, Commun. Math. Phys. 141, No. 1, 79-117 (1991; Zbl 0739.53065)].
Reviewer: J.Hebda (St.Louis)

### MSC:

 57N10 Topology of general $$3$$-manifolds (MSC2010) 57R15 Specialized structures on manifolds (spin manifolds, framed manifolds, etc.) 57N13 Topology of the Euclidean $$4$$-space, $$4$$-manifolds (MSC2010) 57M27 Invariants of knots and $$3$$-manifolds (MSC2010) 57R22 Topology of vector bundles and fiber bundles

### Keywords:

stable framings; 2-framings

### Citations:

Zbl 0739.53065; Zbl 0716.57011
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