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The formula with the obelus is merely tabulated by Rahn with no text, and if the motivation was known, Cajori would have mentioned it in History Of Mathematical Notations, which is a classical treatise. It is likely that Rahn (or Pell) simply repurposed the minus sign symbol, it was used from Riese's algebra textbook (1525) onward.
In a book, I saw a short anecdote about something called the "Horus-eye" hieroglyph, supposedly used in parts to represent fractions (the book dates to 1997). Wikipedia has an article on the symbol...
I could get a little intuition about preset, poset, and toset. e.g. A toset is, in effect, a linearly ordered set, and a poset is a set in which no more than one element in the same order exists,
I’ve noticed a recurring post on social media that presents an image suggesting the shapes of Hindu-Arabic numerals are connected to the angles within their design: This claim seems dubious to me....
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AFAIK there's rare evidence to show that $\\sum$ has the meaning of "sum" in Greek, so why mathematician chose $\\sum$ to be the summation operator?
Ecliptic longitude may be expressed in degrees; my understanding is that prior to the 19th century, expressions of ecliptic longitude contained zodiacal signs. What contemporaneous accounts describ...
The J symbol can represent the unit of energy but it's also the symbol for the dimension of the candela (or luminous intensity). For the energy unit, it clearly comes from the family name of the E...
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In Wikipedia we find a discussion of historical notations for fractions. In particular. The same fractional notation—with the fraction given before the integer[30]—appears soon after in the work of Leonardo Fibonacci in the 13th century.[33]