The takeaway from this is that models need not be based firmly in reality to be useful What, then, is the criterion for being "based in reality?" Isn't it saf

The takeaway from this is that models need not be based firmly in reality to be useful What, then, is the criterion for being "based in reality?" Isn't it safe to assume that the theories that say space is discretized are also false in some way? Also, a minor but important quibble: calculus itself is not a physical theory.