Leonhard Euler · 1744 · Internet Archive
Methodus inveniendi lineas curvas
All 336 leaves · leaf 256
Transcription
ELASTICIS. 249
$x\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)} = \frac{dp}{dx}$. Hinc ergo elicitur sequens æquatio
$dx = \frac{dp}{(1+pp)^{5/4}\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)}}$
Deinde ob $dy=pdx$, habebitur quoque
$dy = \frac{pdp}{(1+pp)^{5/4}\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)}}$;
quæ duæ æquationes sufficerent ad curvam per quadraturas construendam.
4. Harum formularum sic in genere spectatarum neutra est integrabilis; combinari autem certo quodam modo possunt, ut aggregatum integrationem admittat. Cum enim fit
$d.\frac{2\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)}}{\sqrt{(1+pp)}} = \frac{dp(C-\gamma p)}{(1+pp)^{5/4}\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)}}$
erit $\frac{2\sqrt{(a\sqrt{(1+pp)}+Cp+\gamma)}}{(1+pp)^{1:4}} = Cx - \gamma y + \delta$. Quoniam axis positio est arbitraria, constans $\delta$ fine defectu amplitudinis omitti potest. Deinde vero etiam axis ita mutari potest ut
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