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- James F. Davis, Qayum Khan, ANDREW RANICKI
- 2010

Two types of Nil-groups arise in the codimension 1 splitting obstruction theory for homotopy equivalences of finite CW-complexes: the Farrell–Bass Nil-groups in the non-separating case when the fundamental group is an HNN extension and the Waldhausen Nil-groups in the separating case when the fundamental group is an amalgamated free product. We obtain a… (More)

- N A Wani, Tasleem L Kousar, +6 authors Afzal Wani
- Turkish neurosurgery
- 2011

AIM
To describe imaging findings of cerebral hydatid cysts on computed tomography of brain.
MATERIAL AND METHODS
We retrospectively reviewed CT scans of brain in 5 patients with pathologically confirmed hydatid cysts in cerebral hemispheres. The patients were scanned either on a spiral (single slice) CT or on multidetector-row CT before and after… (More)

- Qayum Khan
- 2006

We classify, up to homeomorphism, all closed manifolds having the homotopy type of a connected sum of two copies of real projective n-space. 1. Statement of results Let P = Pn(R) be real projective n-space. López de Medrano [LdM71] and C.T.C. Wall [Wal68, Wal99] classified, up to PL homeomorphism, all closed PL manifolds homotopy equivalent to P when n > 4.… (More)

- Qayum Khan, Qayum Khan
- 2007

Under certain homological hypotheses on a compact 4–manifold, we prove exactness of the topological surgery sequence at the stably smoothable normal invariants. The main examples are the class of finite connected sums of 4–manifolds with certain product geometries. Most of these compact manifolds have non-vanishing second mod 2 homology and have fundamental… (More)

- Qayum Khan
- 2013

In this article, we announce joint work with Frank Connolly and Jim Davis [6]. This follows an earlier case study of pseudo-free involutions on the n-torus carried out in [5]. The author is grateful to the organizers of the RIMS conferences where these results were disseminated in Asia: Transformation Groups and Surgery Theory (Masayuki Yamasaki, August… (More)

- Qayum Khan
- 2007

Our main result is a generalization of Cappell’s 5-dimensional splitting theorem. As an application, we analyze, up to internal s-cobordism, the smoothable splitting and fibering problems for certain 5-manifolds mapping to the circle. For example, these maps may have homotopy fibers which are in the class of finite connected sums of certain geometric… (More)

- Qayum Khan
- 2012

Article history: Received 17 December 2011 Accepted 6 August 2012

- Qayum Khan
- 2008

Let F be a finite group with a Sylow 2-subgroup S that is normal and abelian. Using hyperelementary induction and cartesian squares, we prove that Cappell’s unitary nilpotent groups UNil∗(Z[F ];Z[F ],Z[F ]) have an induced isomorphism to the quotient of UNil∗(Z[S];Z[S],Z[S]) by the action of the group F/S. In particular, any finite group F of odd order has… (More)

- Qayum Khan
- 2017

Article history: Received 21 June 2016 Accepted 26 January 2017 Available online 30 January 2017