The Junkyard

The following papers were all submitted for publication at one time or another. In each case they were rejected because they did not represent a significant enough contribution to the field. I did not resubmit, because in each case I either agreed with this assessment, or included the results in a subsequent paper. However, modulo minor errors I think they are all essentially correct, and am posting them here because someone might find them interesting. Feel free to contact me about any of these.

Thin Position with respect to
a Heegaard surface

We present a definition ofNormalizing Heegaard-Scharlemann-Thompson Splittingsthin positionfor a knot in a 3-manifold, with respect to a Heegaard surface, motivated by Scharlamenn and Thompson's definition of thin position for 3-manifolds, and Gabai's definition of thin position for knots inS^{ 3}. We then show that if a knot,K, in a 3-manifold,M, whose exterior contains no meridional, planar, essential surfaces, is put in thin position then all thin levels ofKare essential in the complement ofK. A corollary of this is that if a small knot,K, is put in thin position with respect to a strongly irreducible Heegaard surface,F, thenKis in bridge position with respect toF, or it is a core of one of the handlebodies bounded byF. This generalizes a Theorem of Thompson for knots inS^{ 3}. (Updated 10/10/01)

We define a Heegaard-Scharlemann-Thompson (HST) splitting of a 3-manifold $M$ to be a sequence of pairwise-disjoint, embedded surfaces, $\{F_i\}$, such that for each odd value of $i$, $F_i$ is a Heegaard splitting of the submanifold of $M$ cobounded by $F_{i-1}$ and $F_{i+1}$. Our main result is the following: Suppose $M$ ($\neq B^3$ or $S^3$) is an irreducible submanifold of a triangulated 3-manifold, bounded by a normal or almost normal surface, and containing at most one maximal normal 2-sphere. If $\{F_i\}$ is a strongly irreducible HST splitting of $M$ then we may isotope it so that for each even value of $i$ the surface $F_i$ is normal and for each odd value of $i$ the surface $F_i$ is almost normal.2-Normal Surfaces

We then show how various theorems of Rubinstein, Thompson, Stocking and Schleimer follow from this result. We also show how our results imply the following: (1) a manifold that contains a non-separating surface contains an almost normal one, and (2) if a manifold contains a normal Heegaard surface then it contains two almost normal ones that are topologically parallel to it. (Updated 5/2/03)

We define a 2-normal surface to be one which intersects every 3-simplex of a triangulated 3-manifold in normal triangles and quadrilaterals, with one or two exceptions. The possible exceptions are a pair of octagons, a pair of unknotted tubes, an octagon and a tube, or a 12-gon.

In this paper we use the theory of critical surfaces developed in " critical Heegaard surfaces " to prove the existence of topologically interesting 2-normal surfaces. Our main results are (1) if a ball with normal boundary in a triangulated 3-manifold contains two almost normal 2-spheres then it contains a 2-normal 2-sphere and (2) in a non-Haken 3-manifold with a given triangulation the minimal genus common stabilization of any pair of strongly irreducible Heegaard splittings can be isotoped to an almost normal or a 2-normal surface. (Updated 7/25/02)