“The second Definition. Number is that which expresseth the quantitie of each thing.”

— Simon Stevin

Disme: the Art of Tenths, Or, Decimall Arithmetike (1608)

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Simon Stevin 11

Flemish scientist, mathematician and military engineer 1548–1620

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“By the help of God and with His precious assistance, I say that Algebra is a scientific art. The objects with which it deals are absolute numbers and measurable quantities which, though themselves unknown, are related to "things" which are known, whereby the determination of the unknown quantities is possible.”

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“Numbers are the product of counting. Quantities are the product of measurement. This means that numbers can conceivably be accurate because there is a discontinuity between each integer and the next. Between two and three there is a jump. In the case of quantity there is no such jump, and because jump is missing in the world of quantity it is impossible for any quantity to be exact. You can have exactly three tomatoes. You can never have exactly three gallons of water. Always quantity is approximate.”

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Simon Stevin (1548–1620) Flemish scientist, mathematician and military engineer

Disme: the Art of Tenths, Or, Decimall Arithmetike (1608)

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“The second Definition. Number is that which expresseth the quantitie of each thing.”

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