In this context, what does the dot symbol "·" mean? Multiplication? I looked it up on Wikipedia but couldn't find it.
Yes, it denotes ordinary multiplication.
See for example on wikipedia:
http://en.wikipedia.org/wiki/Multiplication#Notation_and_terminology
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Yes, it denotes ordinary multiplication.
See for example on wikipedia:
http://en.wikipedia.org/wiki/Multiplication#Notation_and_terminology