Mathematical Methods in the Physical Sciences · Problem 11.4

FUNCTIONS OF A COMPLEX VARIABLE — Mary Boas

Mathematics — Methods · fundamental-theorem-algebra

Problem

Use Liouville's theorem (Problem 3) to prove the fundamental theorem of algebra (see Problem 7.44). Hint: Let P(z)P(z) be a polynomial of degree ≥1\geq 1; then f(z)=1/P(z)f(z) = 1/P(z) is a bounded analytic function in a region not containing any zeros of P(z)P(z). Disprove the assumption that P(z)P(z) has no zeros anywhere.

Related theory

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