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Weierstrass product inequality

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In mathematics, the Weierstrass product inequality states that for any real numbers 0 ≤ x1, ..., xn ≤ 1 we have

and similarly, for 0 ≤ x1, ..., xn,[1][2]: 210 

where

The inequality is named after the German mathematician Karl Weierstrass.

Proof

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The inequality with the subtractions can be proven easily via mathematical induction. The one with the additions is proven identically. We can choose as the base case and see that for this value of we get

which is indeed true. Assuming now that the inequality holds for all natural numbers up to , for we have:

which concludes the proof.

References

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  1. ^ Toufik Mansour. "INEQUALITIES FOR WEIERSTRASS PRODUCTS" (PDF). Retrieved January 12, 2024.
  2. ^ Dragoslav S., Mitrinović (1970). Analytic Inequalities. Springer-Verlag. ISBN 978-3-642-99972-7.