Wall's obstructions and Whitehead torsion.
When are Topologically Equivalent Orthogonal Transformations Linearly Equivalent?
Whitehead Torsions Vanish in Many S1 Bundles.
Whitehead transfers for S1-bundles, an algebraic description.
Wirtinger presentations for higher dimensional manifold knots obtained from diagrams
A Wirtinger presentation of a knot group is obtained from a diagram of the knot. T. Yajima showed that for a 2-knot or a closed oriented surface embedded in the Euclidean 4-space, a Wirtinger presentation of the knot group is obtained from a diagram in an analogous way. J. S. Carter and M. Saito generalized the method to non-orientable surfaces in 4-space by cutting non-orientable sheets of their diagrams by some arcs. We give a modification to their method so that one does not need to find and...