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I work with arbitrary finite field GF(q), for q power of prime. I've been looking around for some function, which would force, that any element is printed as a positive natural number. i.e. in GF(5), -2 is printed as 3 etc. Is that possible in an easy way? I need to achieve that for arbitraty q. I've been thinking about writing some own function, but it seems intractable for me at the moment.