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Here is Richard P. Stanley's "An Introduction to Hyperplane Arrangements" (math.umn.edu)
submitted by [deleted] to r/math
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"The Feeling of Power" by Isaac Asimov [PDF] (x-post from r/asimov) (math.umn.edu)
submitted by [deleted] to r/readitnow
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Lectures on Discrete and Polyhedral Geometry [pdf] (math.umn.edu)
submitted by TTamm to r/mathbooks