viii
The Chern-Weil construction 383
By HOWARD OSBORN
Characteristic classes and singularities of mappings 397
By RICHARD PORTER
Miscellaneous
Riemannian submersions from spheres 405
By RICHARD H. ESCOBALES, JR.
Some open problems in differential geometry 407
By LEON GREEN
Some geometrical aspects of geodesy 413
By NATHANIEL GROSSMAN
The index theorem for closed geodesies 415
By W. KLINGENBERG
The topology of the solutions of a linear homogeneous differential equation
on Rn 417
By NICOLAAS H. KUIPER
Unique structure of solutions to a class of nonelliptic variational problems . .419
By JEAN E. TAYLOR
Twist invariants and the Pontryagin numbers of immersed manifolds 429
By JAMES H. WHITE
Indexes
Author Index 441
Subject Index 447
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