Here is a link to Igor Pak’s book on Discrete and Polyhedral Geometry (free download) . And here is just the table of contents.
It is a wonderful book, full of gems, contains original look on many important directions, things that cannot be found elsewhere, and great beyond great pictures (which really help to understand the mathematics). Grab it!
Combinatorics and more 
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Just to point out a typo: “discrete” not “discere”. [Thanks!, corrected, G.]
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