Quantity

Definition and stakes

Portrait of Thomas Reid Thomas Reid,  An Essay on Quantity (1843)

“ Mathematics contain properly the doctrine of measure; and the object of this science is commonly said to be quantity; therefore quantity ought to be defined, what may be measured. Those who have defined quantity to be whatever is capable of more or less, have given too wide a notion of it, which, I apprehend, has led some persons to apply mathematical reasoning to subjects that do not admit of it. ”
Source: Wikisource

Portrait of Georg Wilhelm Friedrich Hegel Georg Wilhelm Friedrich Hegel,  Science of Logic (1816)

“ The process of measure, instead of being only the wrong infinite of an endless progression, in the shape of an ever-recurrent recoil from quality to quantity, and from quantity to quality, is also the true infinity of coincidence with self in another. In measure, quality and quantity originally confront each other, like some and other. But quality is implicitly quantity, and conversely quantity is implicitly quality. ”
Source: Gutenberg

Portrait of Thomas Reid Thomas Reid,  An Essay on Quantity (1843)

“ From the nature of quantity we may see what it is that gives mathematics such advantage over other sciences in clearness and certainty; namely, that quantity admits of a much greater variety of relations than any other subject of human reasoning; and, at the same time, every relation or proportion of quantities may, by the help of lines and numbers, be so distinctly defined as to be easily distinguished from all others, without any danger of mistake. ”
Source: Wikisource

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