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First-Order Logic Test

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This Demonstration provides a test in first-order logic. A simple two-dimensional world is inhabited by triangles, squares, and pentagons of three sizes and two colors. The task is to find truth values of ten statements about the world.

Contributed by: Izidor Hafner (March 2011)
Based on an idea by: Jon Barwise and John Etchemendy
Open content licensed under CC BY-NC-SA

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Reference:

J. Barwise and J. Etchemendy, Tarski's World, Stanford, CA: CSLI Publications, 1993.

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