Philosophiæ Naturalis Principia Mathematica (Latin for Mathematical Principles of Natural Philosophy), often referred to as simply the Principia (/prɪnˈsɪpiə, prɪnˈkɪpiə/), is a work in three books by Isaac Newton, in Latin, first published 5 July 1687. After annotating and correcting his personal copy of the first edition, Newton published two further editions, in 1713 and 1726. The Principia states Newton’s laws of motion, forming the foundation of classical mechanics; Newton’s law of universal gravitation; and a derivation of Kepler’s laws of planetary motion (which Kepler first obtained empirically).

https://en.wikipedia.org/wiki/Philosophi%C3%A6_Naturalis_Principia_Mathematica

/duckmath • Jun 3, 2017

Does anyone use Latin abbreviations other than QED (i.e. QEI, QEA, QEF)

Does anyone use Latin abbreviations other than QED (i.e. QEI, QEA, QEF) from math

“Q.E.F.,” sometimes written “QEF,” is an abbreviation for the Latin phrase “quod erat faciendum” (“that which was to be done”). It is a translation of the Greek words used by Euclid to indicate the end of the justification of a construction, while “Q.E.D.” was the corresponding end of proof of a theorem (cf. Heath 1956, pp. 124-129).

http://mathworld.wolfram.com/QEF.html