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Discrete means as opposed to continuous. For instance, people may ask questions about discrete electric charges, discrete spacetime, discrete energies, etc. If discretization is vital/essential to the question, then tag it with this tag.
-5
votes
Why is it hard to give a lattice definition of string theory?
M theory and string theory both have propogators and Feynman diagrams.
The concrete form of the propagators can be easily
obtained, since the problem can be mapped onto the problem of finding the
prop …