## Vol 21 (1967)

#### Articles

 Past and Future Henry Helson, Donald Sarason 5-16
 Inequalities for the Green Function and Boundary Continuity of the Gradient of Solutions of Elliptic Differential Equations. Kjell-ove Widman 17-37
 On Some Trigonometrical Polynomials. Masako Izumi, Shin-ichi Izumi 38-44
 On Integral Representation of Vector Valued Measures. Ulf Ronnow 45-53
 Slice Algebras of Bounded Analytic Functions. Frank T. Birtel 54-60
 Five Diophantine Equations. J. H. E. Cohn 61-70
 Sur le théorème de Beurling-Pollard. Jean-pierre Kahane 71-79
 Sur la positivité de la fonction de Green. Jaak Peetre, Ioan A. Rus 80-89
 On the Absolute Convergence of a Series Associated with a Fourier Series. S. M. Mazhar 90-104
 The Lattice-Graph of the Topology of a Transitive Directed Graph. S. Sullivan Anderson, G. Chartrand 105-109
 Algebras Whose Congruence Lattices are Distributive. Bjarni Jonnson 110-121
 On the Angular Derivative of Regular Functions. B. G. Eke 122-127
 Circular Flows on $S^3$. P. M. Rice 128-135
 A Generalization of a Theorem of Frostman. Walter Rudin 136-143
 The Diophantine Equation $3x^4-2y^2=1$. Richard T. Bumby 144-148
 On the Diophantine Equation $Ax^4-By^2=C$, ($C=1,4$). W. Ljunggren 149-158
 On the Rate of Convergence for Discrete Initial-Value Problems. Jaak Peetre, Vidar Thomée 159-176
 On the Irreducibility of the Trinomials $x^m\pm x^n\pm 4$. Arne T. Jonassen 177-189
 Variétés différentiables sans torsion. G. Vranceanu 190-194
 The Obliquity-Type of a Set of Vectors. Andrew Sobczyk 195-198
 Angle Sums of Convex Polytopes. M. A. Perles, G. C. Shepard 199-218
 On the Structure of the Orthogonal Group. Oma Hamara 219-232
 The Decision Problem for Segregated Formulas in First-Order Logic. M. R. Krom 233-240
 Farey Triangles and Farey Quadrangels in the Complex Plane. Asmus L. Schmidt 241-295
 A Note on the Homology of Local Rings. T. H. Gulliksen 296-300
 Note on Whitehead Products in Spheres. Leif Kristensen, Ib Madsen 301-314
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