D. P. Rideout and R. D. Sorkin (2000), A classical sequential growth dynamics for causal sets, Physical Review D61. gr-qc/9904062.

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BOOK REVIEW on A New Kind of Science by Stephen Wolfram Wolfram - Aaronson (2001)   (Correct)

....the two most serious challenges to a view of nature based on deterministic cellular automata. He conjectures that spacetime is discrete at the Planck scale, of about 10 33 centimeters or 10 43 seconds. This conjecture is not new; it has long been considered in the context of loop quantum gravity [13, 14], and has also received attention in connection with the holographic principle [15] from black hole thermodynamics. But are new ideas o#ered to substantiate the conjecture For Wolfram, spacetime is a causal network, in which events are vertices and edges specify the dependence relations between ....

D. P. Rideout and R. D. Sorkin (2000), A classical sequential growth dynamics for causal sets, Physical Review D61. gr-qc/9904062.

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