Landauʹs Inequality via Hadamardʹs

We give a new definition of the measure of a polynomial. This definition easily leads to a proof of Landauʹs inequality, M(P) ≤ P , just using Hadamardʹs inequality. In the same way, it gives Jensenʹs formula for polynomials. It also allows us to produce an algorithm to compute the measure of a polynomial. Moreover, we get new inequalities of some interest