Calculating Space (German: Rechnender Raum) is Konrad Zuse's 1969 book on automata theory. He proposed that all processes in the universe are computational.[2] This view is known today as the simulation hypothesis, digital philosophy, digital physics or pancomputationalism.[3] Zuse proposed that the universe is being computed by some sort of cellular automaton or other discrete computing machinery,[2] challenging the long-held view that some physical laws are continuous by nature. He focused on cellular automata as a possible substrate of the computation, and pointed out that the classical notions of entropy and its growth do not make sense in deterministically computed universes.
^Zuse, Konrad (1967). "Rechnender Raum"(PDF). Elektronische Datenverarbeitung (in German). 8. Bad Hersfeld, Germany: 336–344. Archived(PDF) from the original on 2020-06-18. Retrieved 2022-08-02. (9 pages)
Alex, Jürgen (2007). "Rechnender Raum". Zur Entstehung des Computers - Von Alfred Tarski zu Konrad Zuse [...] - Tertium non datur. Düsseldorf, Germany: VDI-Verlag. pp. 251–279. ISBN978-3-18-150051-4. ISSN0082-2361.