
“One plus one does not equal two.”
Brace Yourself: The Five Heresies
The God Problem: How a Godless Cosmos Creates (2012)
The Complete Neurotic's Notebook (1981), Love
“One plus one does not equal two.”
Brace Yourself: The Five Heresies
The God Problem: How a Godless Cosmos Creates (2012)
“Minus times minus equals plus,
The reason for this we need not discuss.”
As stated in "The Poet Himself" http://query.nytimes.com/gst/fullpage.html?res=9F01E6D81539F937A35753C1A967948260 by Paul Fussell, in The New York Times (4 October 1981), these lines were a "math mnemonic" which Auden "had to memorize as a child."
Misattributed
Source: The Alphabet of Grace
“The formula 'two plus two equals five' is not without its attractions.”
Part 1, Chapter 9 (page 31)
Notes from Underground (1864)
As quoted in Hermann Weyl, "Emmy Noether" (April 26, 1935) in Weyl's Levels of Infinity: Selected Writings on Mathematics and Philosophy (2012) p. 64.
“If two right lines cut one another, they will form the angles at the vertex equal.”
...
This... is what the the present theorem evinces, that when two right lines mutually cut each other, the vertical angles are equal. And it was first invented according to Eudemus by Thales...
Proposition XV. Thereom VIII.
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)