„math> (\left|x\right\rang \left|y\right\rang- \left|y\right\rang \left|x\right\rang) ... was my first lesson in quantum mechanics, and in a very real sense my last, since the rest is mere technique, which can be learnt from books.“

—  John Clive Ward, J. C. Ward, Memoirs of a Theoretical Physicist (Optics Journal, Rochester, 2004).
John Clive Ward
1924 - 2000
Publicidade

Citações relacionadas

Paul Dirac photo
 Alain photo

„When people ask me if the division between parties of the right and parties of the left, men of the right and men of the left, still makes sense, the first thing that comes to mind is that the person asking the question is certainly not a man of the left.“

—  Alain French philosopher 1868 - 1951
Statement of 1931, as quoted by Marcel Gauchet, Realms of Memory: Rethinking the French Past, Vol. 1 - Conflicts and Divisions, edited by Pierre Nora and Lawrence Kritzman, p. 266

Publicidade
H.L. Mencken photo
Jay Nordlinger photo

„There's a point at which left and right join.“

—  Jay Nordlinger American journalist 1963
"Jaywalking" https://web.archive.org/web/20180913133208/https://jaywalking-tapes.nationalreview.com/jaywalking-035-09.12.2018.mp3 (12 September 2018), National Review

Anne Lamott photo
Adonis Georgiadis photo
Irene Dunne photo
John Avlon photo
Publicidade
Thomas Little Heath photo

„The discovery of Hippocrates amounted to the discovery of the fact that from the relation
(1)\frac{a}{x} = \frac{x}{y} = \frac{y}{b}it follows that(\frac{a}{x})^3 = [\frac{a}{x} \cdot \frac{x}{y} \cdot \frac{y}{b} =] \frac{a}{b}and if a = 2b, [then (\frac{a}{x})^3 = 2, and]a^3 = 2x^3.The equations (1) are equivalent [by reducing to common denominators or cross multiplication] to the three equations
(2)x^2 = ay, y^2 = bx, xy = ab[or equivalently...y = \frac{x^2}{a}, x = \frac{y^2}{b}, y = \frac{ab}{x} ][[File:HeathsApolloniusPgxxColor. jpg|thumb|Doubling the Cube
the 2 solutions of Menaechmus]]and the solutions of Menaechmus described by Eutocius amount to the determination of a point as the intersection of the curves represented in a rectangular system of Cartesian coordinates by any two of the equations (2).
Let AO, BO be straight lines placed so as to form a right angle at O, and of length a, b respectively. Produce BO to x and AO to y.
The first solution now consists in drawing a parabola, with vertex O and axis Ox, such that its parameter is equal to BO or b, and a hyperbola with Ox, Oy as asymptotes such that the rectangle under the distances of any point on the curve from Ox, Oy respectively is equal to the rectangle under AO, BO i. e. to ab. If P be the point of intersection of the parabola and hyperbola, and PN, PM be drawn perpendicular to Ox, Oy, i. e. if PN, PM be denoted by y, x, the coordinates of the point P, we shall have

\begin{cases}y^2 = b. ON = b. PM = bx\\ and\\ xy = PM. PN = ab\end{cases}whence\frac{a}{x} = \frac{x}{y} = \frac{y}{b}.
In the second solution of Menaechmus we are to draw the parabola described in the first solution and also the parabola whose vertex is O, axis Oy and parameter equal to a. The point P where the two parabolas intersect is given by\begin{cases}y^2 = bx\\x^2 = ay\end{cases}whence, as before,\frac{a}{x} = \frac{x}{y} = \frac{y}{b}.</center“

—  Thomas Little Heath British civil servant and academic 1861 - 1940

Thomas Fuller (writer) photo

„5241. To take from the right Hand, and give to the Left.“

—  Thomas Fuller (writer) British physician, preacher, and intellectual 1654 - 1734

Golda Meir photo

„In Israel, we read from right to left.“

—  Golda Meir former prime minister of Israel 1898 - 1978
To Henry Kissinger, US Secretary of State, who had written her that he considers himself 'an American first, Secretary of State second, and a Jew third'

Albert Einstein photo

„If A is success in life, then A = x + y + z. Work is x, play is y and z is keeping your mouth shut.“

—  Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955
Said to Samuel J Woolf, Berlin, Summer 1929. Cited with additional notes in The Ultimate Quotable Einstein by Alice Calaprice and Freeman Dyson, Princeton UP (2010) p 230

Publicidade
Jack Donovan photo
Hillary Clinton photo
Rick Riordan photo
Zlatan Ibrahimović photo

„I went left, he went left. I went right, he went right. I went left again, he went to buy a hot dog.“

—  Zlatan Ibrahimović Swedish association football player 1981
on being marked by Liverpool defender Stephane Henchoz (Kuper, 2011).

Próximo