Bøger af Simon Lentner

A master villain has committed a terrible crime. It's up Detective Papaya to stop the fiend and save Carlton Cabbage from a horrible fate. Who Kidnapped Carlton Cabbage is a hilarious rhyming picture book for young children that adults will enjoy just as much.

Norman's prize knickers have been stolen from his garden. But why would anybody steal his underwear? Detective Papaya is on the case to find the villains, discover their nefarious plan and put them behind bars where they belong. Who Nicked Norman's Knickers is the laugh out loud follow up to Detective Papaya's debut outing in Who Kidnapped Carlton Cabbage. Who Nicked Norman's Knickers is a rhyming picture book for children. It's filled with funny illustrations and hilarious rhymes that will make adults and kids laugh out loud.

The book addresses a key question in topological field theory and logarithmic conformal field theory: In the case where the underlying modular category is not semisimple, topological field theory appears to suggest that mapping class groups do not only act on the spaces of chiral conformal blocks, which arise from the homomorphism functors in the category, but also act on the spaces that arise from the corresponding derived functors. It is natural to ask whether this is indeed the case. The book carefully approaches this question by first providing a detailed introduction to surfaces and their mapping class groups. Thereafter, it explains how representations of these groups are constructed in topological field theory, using an approach via nets and ribbon graphs. These tools are then used to show that the mapping class groups indeed act on the so-called derived block spaces. Toward the end, the book explains the relation to Hochschild cohomology of Hopf algebras and the modular group.