Augustus De Morgan (1806–1871) British mathematician, philosopher and university teacher (1806-1871)
The Differential and Integral Calculus (1836)
p, 125
A Treatise on Isoperimetrical Problems, and the Calculus of Variations (1810)
Augustus De Morgan (1806–1871) British mathematician, philosopher and university teacher (1806-1871)
The Differential and Integral Calculus (1836)
Morris Kline (1908–1992) American mathematician
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 346
Context: Fermat applied his method of tangents to many difficult problems. The method has the form of the now-standard method of differential calculus, though it begs entirely the difficult theory of limits.
Duncan Gregory (1813–1844) British mathematician
Source: Examples of the processes of the differential and integral calculus, (1841), p. 237; Lead paragraph of Ch. XV, On General Theorems in the Differential Calculus,; Cited in: James Gasser (2000) A Boole Anthology: Recent and Classical Studies in the Logic of George Boole,, p. 52
“The living world is not a single array. . . connected by unbroken series of intergrades.”
Theodosius Dobzhansky book Genetics and the Origin of Species
Genetics and the Origin of Species (1951) p. 4.
Douglas McGregor (1906–1964) American professor
Source: The Human Side of Enterprise (1960), p. 175
“This method of mine takes its beginnings where Cavalieri ends his Method of indivisibles.”
John Wallis (1616–1703) English mathematician
...for as his was the Geometry of indivisibles, so I have chosen to call my method the Arithmetic of infinitesimals.
Arithmetica Infinitorum (1656)