“By the way, the = notation was invented by Robert Recorde (1510-1558). He choose two parallel lines as a symbol of equality " because noe 2 thynges can be moare equalle."”

— Brian Hayes (scientist)

Source: Group Theory in the Bedroom (2008), Chapter 11, Identity Crisis, p. 203

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Brian Hayes (scientist) 20

American scientist, columnist and author 1900

Proclus (412–485) Greek philosopher

Proposition XV. Thereom VIII.
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)

“In s (in which 180° = \pi [radians]). Further, each full line (great circle) is of finite length 2 \pi R, and any two full lines meet in two points—there are no parallels!”

Howard P. Robertson (1903–1961) American mathematician and physicist

Geometry as a Branch of Physics (1949)

“We stand now where two roads diverge. But unlike the roads in Robert Frost's familiar poem, they are not equally fair.”

Rachel Carson book Silent Spring

Source: Silent Spring (1962), p. 277
Context: We stand now where two roads diverge. But unlike the roads in Robert Frost's familiar poem, they are not equally fair. The road we have long been traveling is deceptively easy, a smooth superhighway on which we progress with great speed, but at its end lies disaster. The other fork of the road — the one less traveled by — offers our last, our only chance to reach a destination that assures the preservation of the earth.

“If two right lines cut one another, they will form the angles at the vertex equal.”

Proclus (412–485) Greek philosopher

...
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)

“Choose equality.”

Matthew Arnold (1822–1888) English poet and cultural critic who worked as an inspector of schools

"Mixed Essays, Equality" (1879)

“The Procrustean bed is not a symbol of equality. It is no less inequality to have equality among unequals.”

Felix Frankfurter (1882–1965) American judge

Dissenting in New York v. United States, 331 U.S. 284, 353 (1947).
Judicial opinions

“In geometry the following theorems are attributed to him [Thales]—and their character shows how the Greeks had to begin at the very beginning of the theory—(1) that a circle is bisected by any diameter (Eucl. I., Def. 17), (2) that the angles at the base of an isosceles triangle are equal (Eucl. I., 5), (3) that, if two straight lines cut one another, the vertically opposite angles are equal (Eucl. I., 15), (4) that, if two triangles have two angles and one side respectively equal, the triangles are equal in all respects (Eucl. I., 26). He is said (5) to have been the first to inscribe a right-angled triangle in a circle: which must mean that he was the first to discover that the angle in a semicircle is a right angle. He also solved two problems in practical geometry: (1) he showed how to measure the distance from the land of a ship at sea (for this he is said to have used the proposition numbered (4) above), and (2) he measured the heights of pyramids by means of the shadow thrown on the ground”

Thomas Little Heath (1861–1940) British civil servant and academic

this implies the use of similar triangles in the way that the Egyptians had used them in the construction of pyramids
Achimedes (1920)

“The invention of the symbol ≡ by Gauss affords a striking example of the advantage which may be derived from an appropriate notation, and marks an epoch in the development of the science of arithmetic.”

George Ballard Mathews (1861–1922) British mathematician

Part 1, sect. 29.
Theory of Numbers, 1892

“They are women who are standing on their feet in spite of their circumstances, not because of it. Think of how the world can be a much better place if, for a change, we have a better equality, we have equality, we have a representation and we understand war, both from the front-line and the back-line discussion.”

Zainab Salbi (1969) Iraqi American author, women's rights activist

Speech at TEDGlobal 2010

“Luck equals (1) diversification plus (2) persistence.”

James Altucher (1968) American hedge fund manager, entrepreneur, and author

The Power of No: Because One Little Word Can Bring Health, Abundance, and Happiness

“By the way, the = notation was invented by Robert Recorde (1510-1558). He choose two parallel lines as a symbol of equality " because noe 2 thynges can be moare equalle."”

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Brian Hayes (scientist) 20

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