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2015 | OriginalPaper | Buchkapitel

3. Use of the Differential Calculus for Finding the Greatest And the Least Ordinates, to Which Are Reduced Questions De Maximis & Minimis

verfasst von : Robert E. Bradley, Salvatore J. Petrilli, C. Edward Sandifer

Erschienen in: L’Hôpital's Analyse des infiniments petits

Verlag: Springer International Publishing

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Abstract

In Chapter 3 of the Analyse, l’Hôpital turns his attention to problems of maxima and minima. In a manner analogous to the modern method of finding critical numbers of a function, l’Hôpital solves these problems by finding values of the abscissa x for which either dy = 0 or dy is infinite. Among the problems that l’Hôpital considers is finding the maximum ordinate on the closed loop of the Folium of Descartes, maximizing or minimizing surface area of solids, and the so-called Pulley Problem.

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Fußnoten
1
In L’Hôpital (1696) this italicized Latin expression meaning “of maximums and minimums” was used within the French text. See Problem XII on p. 213 for the treatment of these types of problems.
 
2
This is an implicit use of the Intermediate Value Theorem; the author clearly considers this to be self-evident.
 
3
The case of an extremum at a cusp was omitted from the Lectiones. Bernoulli alerted L’Hôpital to this case in Letter 22 (p. 259).
 
4
We note that the case where dy is infinite is not considered, presumably because this does not correspond to a greatest or least ordinate.
 
5
In other words, we wish that ANB: BF: : CB: CE.
 
6
This is the first of many places in L’Hôpital (1696) where the expression un plus grand (a greatest) is used, with the last two words italicized. We translate this as “a maximum,” preserving the emphasis. The words “maximum” or “minimum” are not used in this chapter after Definition II.
 
7
The is the first of many places in L’Hôpital (1696) where un moindre (a least) is used, with both words italicized. We translate this as “a minimum.”
 
8
I.e., surface area not including the base.
 
9
Compare to Problem XVI on p. 215.
 
10
In L’Hôpital (1696) the word campagnes was used, which could mean “countries,” or simply “fields.”
 
11
This is the notation used in L’Hôpital (1696) for \((a^{2} -b^{2})x^{4} +(-2a^{2}f +2b^{2}f)x^{3} +(a^{2}f^{+}a^{2}g^{2} -b^{2}f^{2} -b^{2}h^{2})x^{2} -2a^{2}\mathit{fg}^{2}x+a^{2}f^{2}g^{2} = 0\).
 
12
Two quantities are incommensurable if their ratio is irrational; “removing the incommensurables” means rationalizing the equation.
 
13
Compare to Problem XIX on p. 219. For a modern discussion of this problem, see Hahn (1998).
 
14
In L’Hôpital (1696), this literally says “the complements within two right angles.” We consistently translate this construction as supplementary.
 
15
Compare to Problem XX on p. 220.
 
16
I.e., the shortest twilight. Evening twilight is defined as the length of time from sunset until the time that the center of the sun is 18 below the horizon. Morning twilight is defined similarly for the period before sunrise.
 
17
This right parenthesis was missing in L’Hôpital (1696).
 
18
The term “total sine” is a synonym for the radius.
 
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Metadaten
Titel
Use of the Differential Calculus for Finding the Greatest And the Least Ordinates, to Which Are Reduced Questions De Maximis & Minimis
verfasst von
Robert E. Bradley
Salvatore J. Petrilli
C. Edward Sandifer
Copyright-Jahr
2015
DOI
https://doi.org/10.1007/978-3-319-17115-9_3