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Latest posts from topic “Problema di Cauchy, Bernoulli” Latest posts from topic “Problema di Cauchy, Bernoulli” on “ElectroYou”. 2016-10-09T11:19:52Z https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096 Re: Problema di Cauchy, Bernoulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674352 Shika93 2016-10-18T17:58:27Z 2016-10-18T17:58:27Z
Quindi per y<4x abbiamo [unparseable or potentially dangerous latex formula]
Quindi [unparseable or potentially dangerous latex formula], [unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]
=e^{-x+x_0}\left [ y_0+ \int_{x_0}^{x} 4te^{t-x_0}dt \right ]=
=e^{-x}e^{x_0}\left [ y_0+\int_{x_0}^{x}4te^te^{-x_0}dt  \right ]=
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Re: Problema di Cauchy, Bernoulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674327 dimaios 2016-10-18T16:45:00Z 2016-10-18T16:45:00Z
La 2). Prova a risolvere l'equazione differenziale nella condizione y<4x ma non imporre la condizione di Cauchy, lascia indeterminata la costante nella soluzione.
Re: Problema di Cauchy, Bernoulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674308 Shika93 2016-10-18T15:54:46Z 2016-10-18T15:54:46Z
Fin qui ci sono. Non ho capito quindi qual è l'errore. Ho sbagliato i conti e quindi devo rivederli, o ho proprio cannato l'equazione che devo risolvere per y<4x?
Re: Problema di Cauchy, Bernulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674270 dimaios 2016-10-18T12:04:58Z 2016-10-18T12:04:58Z
Puoi vederlo così.



Trovi la soluzione a destra a sinistra e poi hai due condizioni, una è quella di Cauchy e l'altra è il raccordo tra le due soluzioni.
Re: Problema di Cauchy, Bernulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674258 Shika93 2016-10-18T10:39:01Z 2016-10-18T10:39:01Z
Quando considero la parte negativa del modulo se non ho capito male devo cambiare la condizione iniziale con la soluzione di quella precedente. No?
L'hanno più o meno spiegato per via grafica, dicendo che fino al punto [unparseable or potentially dangerous latex formula] ha un andamento per il modulo positivo, dopo di che si deve risolvere "un altro" problema con come condizione iniziale, la soluzione che abbiamo trovato sopra e l'equazione con i segni cambiati dato che si considera il modulo negativo.

Se ho capito male allora la rifaccio senza stare a guardare i conti che ho fatto.
Re: Problema di Cauchy, Bernulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p674227 dimaios 2016-10-18T00:22:05Z 2016-10-18T00:22:05Z
Per y \ge 4x la soluzione è corretta e viene [unparseable or potentially dangerous latex formula]
Per y < 4x vedo un disastro. Prova a semplificare in una forma decente l'ultima espressione ( analogamente al caso precedente ).
E questo da dove viene fuori ?

[quote="Shika93"]Ora devo considerare per il modulo negativo, il che significa che devo risolvere un altro problema:
[unparseable or potentially dangerous latex formula]


Lo so da dove lo hai tirato fuori ma ti sembra corretto ?
L'equazione differenziale è una sola non ce ne sono due diverse, semplicemente la risolvi in due parti distinte del piano xy separate dalla retta y=4x.
Problema di Cauchy, Bernoulli https://www.electroyou.it/forum/viewtopic.php?f=7&t=66096#p672593 Shika93 2016-10-09T11:19:52Z 2016-10-09T11:19:52Z
Ho un problema con questo esercizio.
[unparseable or potentially dangerous latex formula]
Mi viene chiesto di determinare se è globalmente Lipschitziana quindi applico la definizione
[unparseable or potentially dangerous latex formula]
quindi
||y_1-4x|-|y_2-4x|\leq 1|y_1-4x-y_2-4x| quindi posso dire che è globalmente Lip.
Per risolverla la restringo prima in una striscia [unparseable or potentially dangerous latex formula] quindi y_1-4x=1-0=1 > 0 e quindi posso togliere il modulo.
[unparseable or potentially dangerous latex formula]. [unparseable or potentially dangerous latex formula] quindi la risolvo con Bernulli
[unparseable or potentially dangerous latex formula]
dove in questo caso:[unparseable or potentially dangerous latex formula], [unparseable or potentially dangerous latex formula]
Quindi viene

[unparseable or potentially dangerous latex formula]
Questo considerando il modulo positivo. Cioè fino [unparseable or potentially dangerous latex formula]

Ora devo considerare per il modulo negativo, il che significa che devo risolvere un altro problema:
[unparseable or potentially dangerous latex formula]
ed è qui che mi vengono i problemi. Potreste correggermi se c'è qualche errore? In questo caso ho [unparseable or potentially dangerous latex formula], [unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
A questo punto espando, raccolgo e semplifico il semplificabile e questo dovrebbe essere il risultato per [unparseable or potentially dangerous latex formula]

Grazie se avete avuto la pazienza di arrivare in fondo.