Math Problem Statement
Seja {an}n uma sequˆencia de termos positivos tais que P∞ n=1 an < +∞. Prove que X∞ n=1 √ an n < +∞. (*) Indica ̧c ̃ao: Use adequadamente a desigualdade 2xy ≤ x 2 + y 2 para todo x, y ∈ R.
Solution
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Math Problem Analysis
Mathematical Concepts
Series convergence
Inequalities
Formulas
Cauchy-Schwarz inequality
Theorems
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Suitable Grade Level
Advanced undergraduate