## Vol 82, No 2 (1998)

#### Articles

 The Diophantine system $x^2-6y^2=-5,\ x=2z^2-1$ J. H. E. Cohn 161-164
 Families of surfaces: Height functions and projections to planes J.W. Bruce, P.J. Giblin, F. Tari 165-185
 On the Ricci curvature of a hypersurface in a sphere Mehmet Erdogan 186-190
 On Singularities of Folding Maps and Augmentations Kevin Houston 191-206
 The Chern-Euler number of circle bundle via singularity theory M. È. Kazarian 207-236
 K-Theory for $C^*$-algebras associated with subshifts Kengo Matsumoto 237-255
 The Polynomial Approximation Property in Fock-type Spaces A. A. Borichev 256-264
 An algebraic multiplicity theory for analytic operator-valued functions Jón Arason, Robert Magnus 265-286
 Exposed faces of the unit ball in a JBW*-triple C. Martin Edwards, Gottfried T. Rüttiman 287-304
 When matrices commute Terry A. Loring 305-319
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