We investigate the invariant rings of two classes of finite groups $G\leq{\rm GL}(n,F_q)$ which are generated by a number of generalized transvections with an invariant subspace $H$ over a finite field $F_q$ in the modular case. We name these groups generalized transvection groups. One class is concerned with a given invariant subspace which involves roots of unity. Constructing quotient groups and tensors, we deduce the invariant rings and study their Cohen-Macaulay and Gorenstein properties. The other is concerned with different invariant subspaces which have the same dimension. We provide a explicit classification of these groups and calculate their invariant rings., Xiang Han, Jizhu Nan, Chander K. Gupta., and Obsahuje bibliografické odkazy
On August 21, 1968, the Soviet and its Warsaw Pact allies invaded the Czechoslovak Republic, after negotiations failed, to prevent Alexander Dubcek´s Prague Spring reforms from continuing. The Soviets mustered thousands of troops from most Warsaw pact countries. The invasion was successful in stopping democratization reforms and strengthening the authority of the Communist Party of Czechoslovakia. and Jitka Vondrová.
Stále zastoupení České republiky při EU hostilo 3. června 2015 půldenní konferenci věnovanou výzkumu invazivních nepůvodních druhů a chorob, kterou ve spolupráci se Stálým zastoupením a Ministerstvem zemědělství ČR uspořádala Česká styčná kancelář pro výzkum, vývoj a inovace v Bruselu (CZELO). and Pavlína Pancová Šimková.