WIN 10 EUR FOR SUGGESTING A GOOD REFERENCE!

I am looking for good textbooks or other materials (e.g. tutorials, web pages) which give a concise, clear, and mathematically correct description of the following topics: These tools are used by very many people, but it seems that there are not so many who understand them, and even less who can explain them to others.
I promise an award of 10 EUR for the first person showing me a material which could be recommended for explanation of any of these topics.
(I retain the right to decide whether the reference really satisfies my criteria.)

Czech version follows:

ODMĚNA 10 EUR ZA NALEZENÍ VHODNÉ LITERATURY!

Hledám učebnice (tutoriály, webové stránky) poskytující stručný, srozumitelný a matematicky korektní výklad následujících témat: Mnoho lidí používá tyto metody, méně je chápe, a velmi málo z nich je umí dobře vyložit.
Slibuji odměnu 10 EUR tomu, kdo mi první ukáže materiál, podle něhož by se dalo vykládat kterékoli z výše uvedených témat.
(Vyhrazuji si právo posoudit splnění kritérií.)

I thank those who already responded to this request, whether their suggestions were found satisfactory or not (both cases occurred). Till 28.2.07, two awards were acknowledged and several suggestions were rejected, others are under consideration.

Page created 13.12.06, last update not sooner than 28.2.07.

Contact: http://cmp.felk.cvut.cz/~navara, navaramath.feld.cvut.cz