- #1

LagrangeEuler

- 717

- 20

One question. In the text

http://locomat.loria.fr/napier/napier1619construction.pdf

author calculate

##y′_β=−10^7a^t lna##

for

##y_β=10^7a^t##

(see pages 4 and 5)

why minus sign in derivative? ##y_{\beta}'## is speed. And they use minus sign as I see just to obtain positive quantity for ##y′_β=10^7a^t lna##. Is there any relation between that sign and motion of the particle? Particle moves in the some law of geometric progression.

http://locomat.loria.fr/napier/napier1619construction.pdf

author calculate

##y′_β=−10^7a^t lna##

for

##y_β=10^7a^t##

(see pages 4 and 5)

why minus sign in derivative? ##y_{\beta}'## is speed. And they use minus sign as I see just to obtain positive quantity for ##y′_β=10^7a^t lna##. Is there any relation between that sign and motion of the particle? Particle moves in the some law of geometric progression.

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