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Wikipedia definition
1. Billiard-ball computerA billiard-ball computer, also known as a conservative logic circuit, is an idealized model of a reversible mechanical computer based on newtonian dynamics, proposed in 1982 by Edward Fredkin and Tommaso Toffoli. Instead of using electronic signals like a conventional computer, it relies on the motion of spherical billiard balls in a friction-free environment made of buffers against which the balls bounce perfectly.
Read “Billiard-ball computer” on English Wikipedia
Read “ビリヤードボール・コンピュータ” on Japanese Wikipedia
Read “Billiard-ball computer” on DBpedia

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