Egyptian fraction

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This article gives a basic definition in the following area: number theory
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Definition

Let $d$ be a natural number, and $a_{1},\dots ,a_{d}$ be natural numbers.

Then a number of the form ${\frac {1}{a_{1}}}+{\frac {1}{a_{2}}}+\dots +{\frac {1}{a_{d}}}$ is called an Egyptian fraction.