Gauge Theory, Isotropy, and Surfaces in Affine 4-Space

The surface theory in the equiaffine space R⁴ is developed on the basis of H. Weyl’s gauge theory. Rescaling of the Weyl geometry leads to a 1-parameter family of invariant transversal plane bundles containig former special constructions. A transversal bundle metric is gained via the notion of isotropy. The paper then proceeds with a general tensorial theory, including theorema egregium and Radon-type results and a discussion of cubic fundamental forms. Finally there is given an application to homogeneous surfaces.     

NMR-spektroskopische Untersuchungen an gemischt-halogenierten Bortrihalogenid-Addukten mit Dimethyl-N-Chloramin

N.M.R. Spectroscopical Studies on Mixed Halogenated Boron Trihalide Adducts of Dimethyl-N-Chloroamine It is reported about the formation and n.m.r. spectroscopical characterization of mixed boron trihalide adducts (CH₃)₂NCl · BF₂Cl and (CH₃)₂NCl · BFCl₂.     

Vinyl cations 33 : 1-alkene-3-yne-2-yl triflates,precursors of triple bond stabilized vinyl cations - synthesis and first solvolytic studies.

The α-alkynyl vinyl triflates ($\text{3}$) are synthesized and the solvolyses reactions studied in different solvents. The solvolysis products and kinetic data indicate, that the hitherto unknown triple bond stabilized vinyl cation $\text{2a}$ ? $\text{2b}$ is formed as an intermediate.     

Zur asymptotischen Störungstheorie für Eigenwertaufgaben mit diskreten Teilspektren

Ohne Zusammenfassung