# Tag Info

Accepted

### What is the origin of the negation ( ¬ ) operator from logic?

If vague resemblance is enough, then "$¬$" resembles "$-$", which denotes negation in arithmetic. Lambert in Sechs Versuche einer Zeichenkunst in der Vernunftlehre (1782) and Boole ...
• 67.1k

### Who said $\pi$ is a constant since it is not even a real number?

The first Hebrew sentence of the Bible (Genesis 1:1) conains 7 words composed of 22 letters.
Accepted

### Origin of the term "affixe"/"affix" in the geometric treatment of complex numbers

According to Eduard Study and Élie Cartan [1], it was Cauchy who introduced the term affixe in Sur la quantité géométrique $\mathrm{i} = 1_{\frac{\pi}{2}}$, et sur la réduction d'une quantité ...
• 231

### Was the word 'gravity' an invention of Newton?

This is a supplement to the two (good) answers by @Mauro Allegranza and @Viktor Blasjo. Although these answers and the question now have some age to them, it seems worth clarifying them by adding some ...
• 3,044