数论中的基本方法

Thissecondeditionof"CategoriesWork"addstwonewchaptersontopicsofactiveinterest.Oneisonsymmetricmonoidalcategoriesandbraidedmonoidalcategoriesandthecoherencetheoremsforthem--itemsofinterestintheirownrightandalsoinviewoftheiruseinstringtheoryinquantumfieldtheory.Thesecondnewchapterdescribes2-categoriesandthehigher-dimensionalcategoriesthathaverecentlycomeintoprominence.Inaddition，thebibliographyhasbeenexpandedtocoversomeofthemanyotherrecentadvancesconcerningcategories.