413 research outputs found
Lunar surface engineering properties experiment definition Quarterly report, 1 Oct. - 31 Dec. 1968
Mechanical properties of simulated lunar soil
Cohomology of finite dimensional pointed Hopf algebras
We prove finite generation of the cohomology ring of any finite dimensional
pointed Hopf algebra, having abelian group of grouplike elements, under some
mild restrictions on the group order. The proof uses the recent classification
by Andruskiewitsch and Schneider of such Hopf algebras. Examples include all of
Lusztig's small quantum groups, whose cohomology was first computed explicitly
by Ginzburg and Kumar, as well as many new pointed Hopf algebras. We also show
that in general the cohomology ring of a Hopf algebra in a braided category is
braided commutative. As a consequence we obtain some further information about
the structure of the cohomology ring of a finite dimensional pointed Hopf
algebra and its related Nichols algebra.Comment: 36 pages, references adde
Material studies related to lunar surface exploration Technical summary report, 6 Mar. 1967 - 30 Jun. 1968
Summary of research studies on lunar surface material propertie
Material studies related to lunar surface exploration. Volume 4 - Preliminary studies for the design of engineering probes Final report, 6 Mar. 1967 - 30 Jun. 1968
Preliminary design of engineering probes for studying lunar surface material propertie
Material studies related to lunar surface exploration. Volume 1 - Lunar soil mechanics and soil properties Final report, 6 Mar. 1967 - 30 Jun. 1968
Lunar soil mechanics and properties for structural engineering aspects of lunar spacecraft landings and surface exploratio
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