Concentration lectures

English is my second language. I did my best trying to write in English but I can't guarantee I did no mistakes. If you spot any language errors please fell free to drop me a line.

However, if you want to use this material not to learn English, but to learn something about concentrations, your are on the safe side. At the same time I know nobody is perfect, so if you think some corrections are needed, I am ready to discuss it with you.