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A comment on There Is a Time Like the Present. Parent comment
https://phys.org/news/2015-03-einstein-scientists-spacetime-...
(the news piece focuses on foam, but the constraint applies generally to any kind of discrete structure where derivatives get replaced by stencils).
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https://phys.org/news/2015-03-einstein-scientists-spacetime-...
(the news piece focuses on foam, but the constraint applies generally to any kind of discrete structure where derivatives get replaced by stencils).