The script by Walter Farkas and Martin Schweizer can be bought from the assistants. Additional material for the lecture course in form of slides, R-scripts or references to the literature can be found on this page.
Some slides introducing basic concepts of mathematical Finance and interest rate markets can be found here.
Information on the legacy and impact of Louis Bachelier you can find at the Bachelier Society's webpage on Louis Bachelier. His thesis can be found here.
Download the texmacs file arbitrage.tm simulating an innocent looking three dimensional market situation with arbitrage. To run the code install R, the R-project for statistical computing, on your computer, link it with Texmacs, a very useful teaching interface for tex, octave, scilab and sage, and load the arbitrage.tm file into texmacs.
Some lectures notes on mathematical finance for discrete and continuous time markets can be found here. All important concepts for discrete markets can be found there.