## Vol 9 (1961)

#### Articles

 Opérateurs différentiels partiellement hypoelliptiques et partiellement elliptiques. L. Garding, B. Malgrange 5-21
 Partially Hypoelliptic Differential Equations of Finite Type. Jöran Friberg 22-42
 On the Weak Convergence of Stochastic Processes. Monroe D. Donsker 43-54
 On Uniqueness Theorems for Differential Equations With Constant Coefficients. Benny Brodda 55-68
 On the Asymptotic Distribution of Eigenvalues of Certain One-Dimensional Sturm-Liouville Operators. Jan Lanke 69-79
 Verification of a Conjecture of Th. Skolem. Edward S. O'keefe 80-82
 Complements to the Karhunen Representation. I. Fleischer, A. Kooharian 83-89
 The $q$-Series Generalization of a Formula of Sparre Andersen. H. W. Gould 90-94
 On Two Properties of Free Algebras. Bjarni Jonsson, Alfred Tarski 95-101
 On Some Results of Jonnsson and Tarski Concerning Free Algebras. H. Jerome Keisler 102-106
 Some Estimates for Eigenfunction Expansions and Spectral Functions Corresponding to Elliptic Differential Operators. Nils Nilsson 107-121
 Determinants of a Certain Class of Non-Hermitian Toeplitz Matrices. Glenn Baxter, Palle Schmidt 122-128
 Some Remarks on the Exponential Mapping for an Affine Connection. Sigurdur Helgason 129-146
 Sur les espaces d'interpolation; dualité. J. -l. Lions 147-177
 Hypoelliptic Convolution Equations. Lars Hörmander 178-184
 A Problem for Elliptic Partial Differential Operators Defined on an Arbitrary Open Set. N. O. Wallin 185-196
 On Universal Moment Problems. Lennart Carleson 197-206
 Sur une certaine classe d'équations intégrales singulières. V. Stenström 207-228
 Remarks on Proofs by Cyclotomic Formulas of Reciprocity Laws for Power Residues. Th. Skolem 229-242
 Some Combinatorial Theorems for Continuous Parameter Processes. Edgar Reich 243-257
 On Estimating the Solutions of Hypoelliptic Differential Equations Near the Plane Boundary. Jaak Peetre 337-351
 A Generalization of a Combinatorial Theorem of Sparre Andersen About Sums of Random Variables. Achi Brandt 352-358
 Abbildungen vom Hilbert-Schmidtschen Typus und ihre Anwendungen. Krysztof Maurin 359-371
 Convex Ideals and Positive Multiplicative Forms in Partially Ordered Algebras. George Maltese 372-382
 On the Rate of Growth of the Partial Maxima of a Sequence of Independent Identically Distributed Random Variables. Ole Barndorff-nielsen 383-394
 Limit Theorems for Certain Random Walks. Lars Garding 395-408
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