## Vol 68 (1991)

#### Articles

 The converse to Alexandre Froda's irrationality criterion. David Sanker 5-18
 Equivariant Eilenberg-MacLane spaces of type 1. Jan-alve Svensson 19-26
 Ternary additive problems of Waring's type. Jörg Brüdern 27-45
 Sous-espaces complémentés isomorphes à $c_0$ dans les produits tensoriels de Saphar. Eve Oja 46-52
 Traces of commutators of Möbius transformations. Mika Seppälä, Tuomas Sorvali 53-58
 On the Poisson equation in the potential theory of a single kernel. E. Nummelin 59-82
 The existance of nontrival solutions of Volterra equations. W. Mydlarczyk 83-88
 Topological Frobenius properties for nilpotent groups. II. Eberhard Kaniuth 89-107
 A decomposition theorem for regular extensions of von Neumann algebras. Erik Bédos 108-114
 Relative commutant algebras of Powers' binary shifts on the hyperfinite $\mathrm{II}_1$ factor. M. Enomoto, M. Nagisa, Y. Watatani 115-130
 Models of representations of some classical supergroups. D. Leites, V. Serganova 131-147
 Generalization of the general Diophantine approximation theorem of Kronecker. Erling Folner 148-160
 Smash products, group actions and group graded rings. Anders Jensen, Soren Jondrup 161-170
 The Diophantine equation $X(X + 1) = Y(Y^2 + 1)$. J. H. E. Cohn 171-179
 On Rödseth's $h$-bases $A_k=\{1,a_2,2a_2,\dots,(k-2)a_2,a_k\}$. Ernst S. Selmer, Björg Kristin Selvik 180-186
 On simple germs with non-isolated singularities. A. Zaharia 187-192
 Embeddings of $n$-dimensional locally compact metric spaces to $2n$-manifolds. Juoni Luukkainen 193-209
 Maximum principles for subharmonic functions. Stephen J. Gardiner 210-220
 Indice d'esperances conditionnelles et algebres de von Neumann finies. Paul Jolissaint 221-246
 Vector valued Loeb measures and the Lewis integral. Horst Osswald 247-268
 Locally compact $F$-spaces, sub-stonean spaces and quotients of locally compact groups. Esben T. Kehlet 269-272
 Riesz distributions. Johan A. C. Kolk, V. S. Varadarajan 273-291
 Von Neumann inequality for $(B(\mathscr{H})^n)_1$. Gelu Popescu 292-304
 Ultra-irreducibility of induced representations. Jacob Jacobsen, Henrik Stetkaer 305-319
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