## Vol 67 (1990)

#### Articles

 Cancellation of Abelian groups of finite rank modulo elementary equivalence. Francis Oger 5-14
 4-critical 4-valent planar graphs constructed with crowns. G. Koester 15-22
 Equivariant Alexander-Spanier cohomology for actions of compact Lie groups. Hannu Honkasalo 23-34
 Existence of meromorphic solutions of algebraic differential equations. Gary G. Gundersen, Ilpo Laine 35-55
 On a spanned tautological bundle. Harry D'souza 56-60
 Conformal welding of rectifiable curves. Christopher J. Bishop 61-72
 Density of the self-adjoint elements with finite spectrum in an irrational rotation $C^*$-algebra. Man-duen Choi, George A. Elliot 73-86
 Involutory antiautomorphisms of von Neumann and $C^*$-algebras. Jorund Gasemyr 87-96
 On a complete initial-boundary value problem for parabolic pseudo-differential operators. Veikko T. Purmonen 97-118
 On the casual structure of homogeneous manifolds. Joachim Hilgert, Karl H. Hofmann 119-144
 The weighted Poincaré inequalities. Ritva Hurri 145-160
 A homological proof of a theorem by Davis, Geramita, Orecchia giving the Cayley-Bacharach theorem. Rickard Sjögren 161-166
 Sophie Germain's principle and Lucas numbers. Anastasios Simalarides 167-176
 On modules induced or coinduced from Hopf subalgebras. K. -h. Ulbrich 177-182
 Stanley decompositions of the Bracket ring. Bernd Sturmfels, Neil White 183-189
 On formulas for the Frobenius number of a numerical semigroup. Frank Curtis 190-192
 Betti numbers of Buchsbaum complexes. Anders Björner, Takayuki Hibi 193-196
 Classification of irreducible projective surfaces of smooth sectional genus $\leqq 3$. M. Andreatta, A. J. Sommese 197-214
 The smooth surfaces on cubic hypersurface in $\mathsf{P}^4$ with isolated singularities. Alf Bjorn Aure 215-222
 A remark on the retracting of a ball onto a sphere in an infinite dimensional Hilbert space. Tomasz Komorowski, Jacek Wosko 223-226
 Spaces making continous convergence and locally uniform convergence coincide, their very weak P-property, and their topological behaviour. H. -p. Butzmann, M. Schroder 227-254
 Pointwise measurability in nonstandard models. Dieter Landers, Lothar Rogge 255-258
 Transpositions of UHF algebras. Joseph F. Conrad 259-272
 The transmission property. Gerd Grubb, Lars Hörmander 273-289
 The Levi problem in non-locally convex seperable topological vector spaces. Aboubakr Bayoumi 290-298
 Stable rank of Fourier algebras and an application to Korovkin theory. Michael Pannenberg 299-319
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