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Definition: polynomial evaluation
[ ]: Poly x R -> R p[a] := (sum0 <= i <= deg(p) pi *R ai).
Example: p := 2+3*x+4*x*x:
p = [2, 3, 4, 0, 0, 0, 0, ...] p[5] = 2*50+3*51+4*52 = 117.