Henrietta Swan Leavitt quotes
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“A straight line can readily be drawn among each of the two series of points corresponding to maxima and minima, thus showing that there is a simple relation between the brightness of the variables and their periods.”
-- Henrietta Swan LeavittSource : "Periods of 25 Variable Stars in the Small Magellanic Cloud". Harvard College Observatory Circular, vol. 173, (pp. 1-3), 1912.
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Source : A. Lee Martinez (2007). “In the Company of Ogres”, p.133, Macmillan
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Source : "Naţionalitatea în artă" ("Nationality in Art") by A. C. Cuza, Bucureşti: Cartea Romaneasca, 1905.
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“One man's constant is another man's variable.”
Source : Alan J. Perlis (1975). “Introduction to computer science”
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Source : "'Over the different views with regard to the actual infinite numbers' ('Ueber die verschiedenen Ansichten in Bezug auf die actualunendlichen Zahlen')". Book by Georg Cantor, 1886.
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