English | 158 pages | Springer; 2011th edition (9 July 2011) | 3642217737 | PDF | 5 Mb
This work introduces tools, from the field of category theory, that make it possible to tackle until now unsolvable representation problems (determination of the range of a given functor). The basic idea is: if a functor lifts many objects, then it also lifts many (poset-indexed) diagrams.