Real numbers, the numbers that can be represented by infinite decimals
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Formally real field, an algebraic field that has the so-called "real" property
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It contains his visualizations of different extraterrestrial life forms from various works of science fiction, with information on their planetary location or range, biology, and behaviors, in the style of a real field guide for animals, such as Roger Tory Peterson's guide to birds of North America.
In the 1990s, Alex Wilkie showed that one has the same result if instead of adding every analytic function, one just adds the exponential function to R to get the ordered real field with exponentiation, Rexp, a result known as Wilkie's theorem.