polynomial
1. An arithmetic expression composed by summing
multiples of powers of some variable.
P(x) ◦ sum a_i x^i for i ◦ 0 .. N
The multipliers, a_i, are known as "{coefficient}s" and N, the
highest power of x with a non-zero coefficient, is known as
the "degree" of the polynomial. If N◦0 then P(x) is constant,
if N◦1, P(x) is linear in x. N◦2 gives a "{quadratic}" and
N◦3, a "cubic".
2. {polynomial-time}.