1. A generalization of a maximum principle for the wave-operator with lower order terms

   • Wolf Hofmann

   OriginalPaper Pages: 1 - 9

2. On the singularities of foliations and of vector bundle maps

   • Bruce F. Golbus

   OriginalPaper Pages: 11 - 35

3. Minimal submanifolds of the bicylinder boundary

   • Thomas F. Banchoff

   OriginalPaper Pages: 37 - 57

4. Coefficient rings of isomorphic group rings

   • M. M. Parmenter

   OriginalPaper Pages: 59 - 63

5. On G-spaces

   • Peter Hilton

   OriginalPaper Pages: 65 - 73

6. Abstract non-linear hyperbolic equation in Hilbert spaces

   • Pedro H. Rivera Rodriguez

   OriginalPaper Pages: 75 - 83