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2. mathematics - How did the obelus ÷ come to stand for division ...

   hsm.stackexchange.com/questions/9529/how-did-the-obelus-÷-come-to-stand-for...

   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.

3. How did the theory of the Horus-eye fractions originate?

   hsm.stackexchange.com/questions/2439/how-did-the-theory-of-the-horus-eye...

   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...

4. How did the definition of each "ordered set" come about?

   hsm.stackexchange.com/questions/11808/how-did-the-definition-of-each-ordered...

   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,

5. How did Hindu-Arabic Numerals get their shapes?

   hsm.stackexchange.com/questions/15878/how-did-hindu-arabic-numerals-get-their...

   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....

6. What does the "G" for the similitude groups stand for?

   hsm.stackexchange.com/questions/7614/what-does-the-g-for-the-similitude-groups...

   Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

7. Why choose symbol $\\sum$ to be the summation operator in maths?

   hsm.stackexchange.com/questions/3741/why-choose-symbol-sum-to-be-the-summation...

   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?

8. When did contemporary practices for indicating ecliptic longitude...

   hsm.stackexchange.com/questions/13607/when-did-contemporary-practices-for...

   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...

9. Dimension of the candela unit: What does J stand for?

   hsm.stackexchange.com/questions/9886/dimension-of-the-candela-unit-what-does-j...

   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...

10. Did anyone apply for a patent based on sphere packing?

    hsm.stackexchange.com/questions/15859/did-anyone-apply-for-a-patent-based-on...

    Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

11. Who introduced the mixed fraction notation? - History of Science...

    hsm.stackexchange.com/questions/14921/who-introduced-the-mixed-fraction-notation

    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]