# Symbolic Systems

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Symbolic systems set up simple idealizations of iterations of replacement rules in *Mathematica*. For example, , where can be any symbol, and and can be any expressions, says to replace the pattern on the left by what is on the right. For example, using the initial condition for this Demonstration, in the expression , is , is , and the result is then .

Contributed by: Abigail Nussey (March 2011)

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