# „The issue is simply whether or not 2+2=4.“

—  Albert Camus, Context: There always comes a time in history when the person who dares to say that 2+2=4 is punished by death. And the issue is not what reward or what punishment will be the outcome of that reasoning. The issue is simply whether or not 2+2=4.
1913 - 1960

### „There always comes a time in history when the person who dares to say that 2+2=4 is punished by death.“

—  Albert Camus French author and journalist 1913 - 1960
Context: There always comes a time in history when the person who dares to say that 2+2=4 is punished by death. And the issue is not what reward or what punishment will be the outcome of that reasoning. The issue is simply whether or not 2+2=4.

### „If you tell me 2 + 2 is 4, and I know it is, then you... shove marbles up your ass, I go "Damn, Anthony shoves marbles in his ass?" But [the fact that you shove marbles in your ass] doesn't invalidate 2 + 2 = 4.“

—  Patrice O'Neal American stand-up comedian, radio personality, and actor 1969 - 2011
May 10, 2011

### „The Rule of Three, or Golden Rule of Arithmeticall whole Numbers. Be the three termes given 2 3 4.... To finde their fourth proporcionall Terme: that is to say, in such Reason to the third terme 4, as the second terme 3, is to the first terme 2 [Modern notation: \frac{x}{4} = \frac{3}{2}].... Multiply the second terme 3, by the third terme 4, & giveth the product 12: which dividing by the first terme 2, giveth the Quotient 6: I say that 6 is the fourth proportional terme required.“

—  Simon Stevin Flemish scientist, mathematician and military engineer 1548 - 1620

### „The writer must be four people: 1) The nut, the obsede 2) The moron 3) The stylist 4) The critic. 1 supplies the material; 2 lets it come out; 3 is taste; 4 is intelligence.“

—  Susan Sontag American writer and filmmaker, professor, and activist 1933 - 2004

### „::1 2 3 4 5 6 7 8 9“

—  Beth Anderson American neo-romantic composer 1950

### „[T]he formalist school, of whom the most eminent representative is Hilbert, have concentrated on the propositions of mathematics, such as '2 + 2 = 4'. They have pronounced these to be meaningless formulae to be manipulated according to arbitrary rules, and they hold that mathematical knowledge consists in knowing what formulae can be derived from what others consistently with the rules.... for example...'2' is a meaningless mark occurring in these meaningless formulae. But... '2' occurs not only in '2 + 2 = 4', but also in 'It is 2 miles to the station', which is not a meaningless formulae, but a significant proposition, in which '2' cannot conceivably be a meaningless mark.“

—  Frank P. Ramsey British mathematician, philosopher 1903 - 1930

### „The multiplication table will not occur in this book, not even the theorem,2 \cdot 2 = 4,but I would recommend, as an exercise, that you define2 = 1 + 1,4 = (((1 + 1) + 1) + 1)and then prove the theorem.“

—  Edmund Landau German Jewish mathematician 1877 - 1938
Grundlagen der Analysis [Foundations of Analysis] (1930) Preface for the Student, as quoted by Eli Maor, Trigonometric Delights (2013)

### „To refer to the Church as a building is to call people 2 x 4's.“

—  Shane Claiborne, The Irresistible Revolution: Living as an Ordinary Radical

### „The number 2 thought of by one man cannot be added to the number 2 thought of by another man so as to make up the number 4.“

—  Simone Weil French philosopher, Christian mystic, and social activist 1909 - 1943
Oppression and Liberty (1958), p. 82

### „In the work of Vieta the analytic methods replaced the geometric, and his solutions of the quadratic equation were therefore a distinct advance upon those of his predecessors. For example, to solve the equation x^2 + ax + b = 0 he placed u + z for x. He then hadu^2 + (2z + a)u +(z^2 + az + b) = 0.He now let 2z + a = 0, whence z = -\frac{1}{2}a,and this gaveu^2 - \frac{1}{4}(a^2 - 4b) = 0.u = \pm \frac{1}{2} \sqrt{a^2 - 4b}.andx = u + z = -\frac{1}{2}a \pm \sqrt{a^2 - 4b}.</center“

—  David Eugene Smith American mathematician 1860 - 1944
p.449

### „All the light which is radiated... will, after it has traveled a distance r, lie on the surface of a sphere whose area S is given by the first of the formulae (3). And since the practical procedure... in determining d is equivalent to assuming that all this light lies on the surface of a Euclidean sphere of radius d, it follows...4 \pi d^2 = S = 4 \pi r^2 (1 - \frac{K r^2}{3} +...);whence, to our approximation 4)d = r (1- \frac{K r^2}{6} +...), orr = d (1 + \frac{K d^2}{6} +...).</center“

—  Howard P. Robertson American mathematician and physicist 1903 - 1961

### „Vieta was the first algebraist after Ferrari to make any noteworthy advance in the solution of the biquadratic. He began with the type x^4 + 2gx^2 + bx = c, wrote it as x^4 + 2gx^2 = c - bx, added gx^2 + \frac{1}{4}y^2 + yx^2 + gy to both sides, and then made the right side a square after the manner of Ferrari. This method... requires the solution of a cubic resolvent.Descartes (1637) next took up the question and succeeded in effecting a simple solution... a method considerably improved (1649) by his commentator Van Schooten. The method was brought to its final form by Simpson (1745).“

—  David Eugene Smith American mathematician 1860 - 1944
p.469

### „Ridin' up in them GTO's and 4-4-2's, Grand Prix's, S. S's, causes we so so cool“

—  Ludacris American rapper and actor 1977
Two Miles and Hour

### „The stages of human development are to strive for: (1) Besitz [Possession] (2) Wissen [Knowledge] (3) Können [Ability] (4) Sein [Being]“

—  Erwin Schrödinger Austrian physicist 1887 - 1961
Writings of August 1918, quoted in A Life of Erwin Schrödinger (1994) by Walter Moore

### „Almost all thinking people agree that you should not have probability 1 (or 0) for any event, other than one demonstrable by logic, like 2 x 2 = 4.“

—  Dennis Lindley British statistician 1923 - 2013
6. Bayes Rule. p. 91.

### „Take a unit, halve it, halve the result, and so on continually. This gives—1 1&frasl;2 1&frasl;4 1&frasl;8 1&frasl;16 1&frasl;32 1&frasl;64 1&frasl;128 &c.;Add these together, beginning from the first, namely, add the first two, the first three, the first four, &c...; We see then a continual approach to 2, which is not reached, nor ever will be, for the deficit from 2 is always equal to the last term added.... We say that—1, 1 + 1&frasl;2, 1 + 1&frasl;2 + 1&frasl;4, 1 + 1&frasl;2 + 1&frasl;4 + 1&frasl;8, &c.; &c.;is a series of quantities which continually approximate to the limit 2. Now the truth is, these several quantities are fixed, and do not approximate to 2.... it is we ourselves who approximate to 2, by passing from one to another. Similarly when we say, "let x be a quantity which continually approximates to the limit 2," we mean, let us assign different values to x, each nearer to 2 than the preceding, and following such a law that we shall, by continuing our steps sufficiently far, actually find a value for x which shall be as near to 2 as we please.“

—  Augustus De Morgan British mathematician, philosopher and university teacher (1806-1871) 1806 - 1871