Some copy-editing

Signed-off-by: Nicolai Hähnle <haehnle@or.uni-bonn.de>
Signed decompositions and Brion's theorem

Signed-off-by: Nicolai Hähnle <haehnle@or.uni-bonn.de>
Evaluation of f(P;1) and some copy-editing

Signed-off-by: Nicolai Hähnle <haehnle@or.uni-bonn.de>
Merge pull request #4 from nhaehnle/master

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