Recursive automorphisms of recursive linear orderings

We characterize by classical order type those recursive linear orderings L such that every classically isomorphic recursive copy R of L has a non-identity recursive automorphism.     

Indole-2,3-quinodimethanes: Generation, reactivity and regioselective control of intermolecular Diels-Alder reactions

N-acylindole-2,3-quinodimethanes generated at low temperature from the N-acyl-2,3-bis (bromomethyl)indoles undergo a variety of cycloadditions including the reversible chelotropic reaction with sulphur dioxide to yield the unreported 1,3-dihydrothieno[3,4-b]indole-2,2-dioxide 9. Successful attempts to control the regioselectivity of reactions with unsymmetrical dienophiles are described.     

An SCF-Xα-SW study of the ionic and covalent state in the NaCl System

The reference level of the separated constituents and the crossing of the potential curves for the ionic and covalent state are discussed with respect to the choice of orbital occupation numbers and Fermi-Dirac statistics. Calculations show a distinct crossing of potentials curves, when using a constraint of integer occupation numbers. No crossing is predicted, when fractional occuption numbers are used, which are adjusted according to Fermi-Dirac statistics.[/p]     

Chromatographie auf mit Ionenaustauschern impr?gniertem Papier

Ohne Zusammenfassung