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Notes:

- Razborov-Smolensky - For distinct primes p and q, Mod_p can not be computed in bounded depth with Mod_q gates

- Linial-Mansour-Nisan Fourier Transform Methods to approximate circuits by low-degree polynomials over rationals and reals. Applications to circuit complexity and learning theory.

- Open even for Mod_q for non-prime q (such as q=6)