Quotes about variability

A collection of quotes on the topic of variability.

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Lawrence M. Krauss photo
Arthur Conan Doyle photo
Emmy Noether photo

„A ring of polynomials in any number of variables over a ring of coeffcients that has an identity element and a finite basis, itself has a finite basis.“

—  Emmy Noether German mathematician 1882 - 1935

As quoted in Morris Kline, Mathematical Thought From Ancient to Modern Times (1972) p. 1153.

Heinrich Hertz photo

„When a constant electric current flows along a cylindrical wire, its strength is the same at every part of the section of the wire. But if the current is variable, self-induction produces a deviation from this… induction opposes variations of the current in the centre of the wire more strongly than at the circumference, and consequently the current by preference flows along the outer portion of the wire. When the current changes its direction… this deviation increases rapidly with the rate of alternation; and when the current alternates many million times per second, almost the whole of the interior of the wire must, according to theory, appear free from current, and the flow must confine itself to the very skin of the wire. Now in such extreme cases… preference must be given to another conception of the matter which was first presented by Messrs. 0. Heaviside and J. H. Poynting, as the correct interpretation of Maxwell's equations as applied to this case. According to this view, the electric force which determines the current is not propagated in the wire itself, but under all circumstances penetrates from without into the wire, and spreads into the metal with comparative slowness and laws similar to those which govern changes of temperature in a conducting body.
…Inasmuch as I made use of electric waves in wires of exceedingly short period in my experiments on the propagation of electric force, it was natural to test by means of these the correctness of the conclusions deduced. As a matter of fact the theory was found to be confirmed by the experiments…“

—  Heinrich Hertz German physicist 1857 - 1894

"On the Propagation of Electric Waves by Means of Wires" (1889) Wiedemann's Annalen. 37 p. 395, & pp.160-161 of Electric Waves
Electric Waves: Being Researches on the Propagation of Electric Action with Finite Velocity Through Space (1893)

Lotfi A. Zadeh photo

„A linguistic variable is a variable whose values are words or sentences in a natural or synthetic language.“

—  Lotfi A. Zadeh Electrical engineer and computer scientist 1921 - 2017

Variant: A linguistic variable is defined as a variable whose values are sentences in a natural or artificial language.
Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

George Pólya photo
Émile Durkheim photo
Shiing-Shen Chern photo

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Henrietta Swan Leavitt photo
Elizabeth Gilbert photo
William Shakespeare photo
David Brin photo

„Rather, for all objects and experiences there is a quantity that has an optimum value. Above that quantity, the variable becomes toxic. To fall below that value is to be deprived.“

—  Gregory Bateson English anthropologist, social scientist, linguist, visual anthropologist, semiotician and cyberneticist 1904 - 1980

Source: Mind and Nature: A Necessary Unity, 1979, p. 56

George Biddell Airy photo
Daniel Dennett photo
Warren Farrell photo
Kenneth Arrow photo

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“