Arithmetica integraMichael Stifel
Arithmetica integra
by Michael Stifel · first published 1544
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…tallying systems, was not commonplace in the seventeenth century. Not to mention old measurement standards, balanced ternary was written about in the sixteenth century (see the cossist Stifel's 1544 Arithmetica Integra) and possibly the ancient Indian Vedas.
on “Binary was invented to weigh wine a century before Leibniz” ↗Negative numbers were popularized in Europe by Michael Stifel's 1544 book Arithmetica Integra, where he called them "numeri absurdi." The concept emerged gradually, as mathematicians found they were useful for solving equations as a kind of "notional convenience," even though they did not think…
on “Why/How is a negative times a negative a positive?” ↗