- #1
sbashrawi
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Homework Statement
Suppose that the power series [tex]\Sigma[/tex][a]_{n}[/tex]z^{n} and
\Sigma b_{n} z^{n} havr radii of convergence R! and R2 respictively. Prove that the radius
of convergence of the multiplication is at least R1 * R2
Homework Equations
The Attempt at a Solution
I found that the convergence radius is > min(R1, R2)