Padé approximant

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What Wikipedia says

In mathematics, a Padé approximant is the "best" approximation of a function near a specific point by a rational function of given order. Under this technique, the approximant's power series agrees with the power series of the function it is approximating.

Excerpt from the Wikipedia article “Padé approximant”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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