This is revealed to be an approximation, or the planet would be infinite (since it rotates around its symmetry axis, the world "ends" before the speed of rotation exceeds that of light).
More precisely, it's the solid of revolution of a rectangular hyperbola spun around one of its asymptotes (the book uses less precise terminology, but it's clear anyway what it's talking about). Mathematics is not central to this novel, but there's at least a fascinating idea: the story is set on a planet with a negative curvature. The author seems to change the direction of the plot towards the last third of the book but its still worth a read. Get pretty weird, but it is still a story well told. Surrounding world is based on hyperbolic functions. Power from a mysterious `optimum point', which is less effective for A list compiled by Alex Kasman ( College of Charleston)
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