Turing machine
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A Turing machine is a mathematical model of computation describing an abstract machine that manipulates symbols on a strip of tape according to a table of rules. Despite the model's simplicity, it is
A physical Turing machine model constructed by Mike Davey. A true Turing machine would need to be provided more memory (tape) if and when required; physical models can only have a finite amount.
The evolution of the busy beaver's computation starts at the top and proceeds to the bottom.
An implementation of a Turing machine
A Turing machine realization using Lego pieces
Hao Wang (academic)
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Hao Wang was a Chinese-American logician, philosopher, mathematician, and commentator on Kurt Gödel.
Wang in 1980
