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To those who ask what the infinitely small quantity in mathematics is, we answer that it is actually zero. Hence there are not so many mysteries hidden in this concept as they are usually believed to be.

— Leonhard Euler Fundamentals of Teaching Mathematics at University Level (2000)

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More quotes by Leonhard Euler

Madam, I have come from a country where people are hanged if they talk.

A function of a variable quantity is an analytic expression composed in any way whatsoever of the variable quantity and numbers or constant quantities.

Introduction to the Analysis of the Infinite (1748)

Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the human mind will never penetrate.

Calculus Gems (1992)

Although to penetrate into the intimate mysteries of nature and thence to learn the true causes of phenomena is not allowed to us, nevertheless it can happen that a certain fictive hypothesis may suffice for explaining many phenomena.

A conjecture about the nature of air (1780)

It would be a considerable invention indeed, that of a machine able to mimic speech, with its sounds and articulations. … I think it is not impossible.

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Quote text and notes from Wikiquote: Leonhard Euler (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.