Geometry and Differential Geometry

On free Minkowski planes.- Rigidity in the geometry of involutory elements of a group.- Ein Trennungsaxiom in der Orthogonalgeometrie und eine Charakterisierung der reellen Ebene.- Applications of the theory of surfaces to the theory of graphs.- Central translation S-space.- Systems of quadrics through a general variety of Segre and their reduction to irreducible parts [2].- Generators and relations for classical groups.- Some combinational problems in geometry.- Über die algorithmische Lösung des Steinitzproblems einer inneren Kennzeichnung polytopaler Sphären.- Regular permutation geometries.- On characterisations of kinematic spaces by parallelisms.- On realizations of vector products by polynomials which are identities for matrix rings.- On the construction of archimedean orders of a free plane.- Rectangular spaces.- On sharply 2-transitive permutation sets.- Dimension of nearaffine spaces.- Generating cryptomorphic axiomatizations of matroids.- Partial planes with exactly two complete parallel classes.- A problem of free mobility.- A unified approach to Miquel's theorem and its degenerations.- Automorphisms of laguerre-geometry and cone-preserving mappings of metric vector spaces.- Bounds for the number of solutions of certain piecewise linear equations.- Zur Translationstransitivität in affinen Hjelmslevebenen.- Near-rings with right inverse property.- On reflections in Minkowski-planes.- On the space of Riemannian metrics on surfaces and contact manifolds.- Circles on surfaces in the euclidean 3-space.- Classes caracteristiques principales et secondaires.- Deformation theory and stability for holomorphic foliations.- Vanishing theorems and stability of complex analytic foliations.- Power series expansions, differential geometry of geodesic spheres and tubes,and mean-value theorems.- On distance-decreasing collineations.- On a parametrix form in a certain V-submersion.- Stable and unstable motions on surfaces.- Vector fields and generalized vector fields on fibered manifolds.- Lie algebras of order 0 on a manifold.- à l'étude de certains systèmes différentiels.- Infinitesimal deformations preserving parallel normal vector fields.- Differential Galois theory.- Counterexamples to a conjecture of Rene Thom.- Conformal invariants on almost Hermitian manifolds.- Conformal changes of almost contact metric structures.