[e2e] Just a very quick remark on system theory Re: Why don't we talk about segments/objects instaead of layers? Re: Lost Layer?
Saverio Mascolo
saverio.mascolo at gmail.com
Fri Feb 21 02:07:10 PST 2014
On Wed, Feb 19, 2014 at 3:55 PM, Detlef Bosau <detlef.bosau at web.de> wrote:
> Am 19.02.2014 12:22, schrieb Saverio Mascolo:
>
> On Wed, Feb 19, 2014 at 9:56 AM, Detlef Bosau <detlef.bosau at web.de> wrote:
>
>> And this is particularly true for engineers as they often don't see the
>> "real" system equations but only the Laplace transform.
>>
>
> laplace transform are equivalent to linear differential equation
>
>
> Yes. And pigs can fly.
>
i would say like planets that fly following the Newton differential
equations.
I think you really need to do some fundamental studies, starting back since
leonardo da vinci and galileo
*«* La filosofia è scritta in questo grandissimo libro che continuamente ci
sta aperto innanzi a gli occhi (io dico l'universo), ma non si può
intendere se prima non s'impara a intender la lingua, e conoscer i
caratteri, ne' quali è scritto. *Egli è scritto in lingua matematica, *e i
caratteri son triangoli, cerchi, ed altre figure geometriche, senza i quali
mezzi è impossibile a intenderne umanamente parola; senza questi è un
aggirarsi vanamente per un oscuro laberinto. *»* (Galileo Galilei, *Il
Saggiatore <http://it.wikipedia.org/wiki/Il_Saggiatore_(Galileo)>*,
Cap. VI<http://it.wikisource.org/wiki/Il_Saggiatore/6#La_filosofia>
)
> You never read a text book on analysis and the requirements for the
> backward transformation to be unique? At least, things are extremele tricky
> here.
>
of course are unique in all cases that are of practical interest. did you
ever had a basic control course? the one where they teach how to use
laplace transform to solve differential equations?
>
> Nevertheless: Differential equations are not suitable for the Internet,
> neither is the Laplace Transform.
>
van Jacobson: "a network is made of gains, integrator and delays"
please go back to study ;)
On Wed, Feb 19, 2014 at 3:55 PM, Detlef Bosau <detlef.bosau at web.de> wrote:
> Am 19.02.2014 12:22, schrieb Saverio Mascolo:
>
> On Wed, Feb 19, 2014 at 9:56 AM, Detlef Bosau <detlef.bosau at web.de>wrote:
>
>> And this is particularly true for engineers as they often don't see the
>> "real" system equations but only the Laplace transform.
>>
>
> laplace transform are equivalent to linear differential equation
>
>
> Yes. And pigs can fly.
>
> You never read a text book on analysis and the requirements for the
> backward transformation to be unique? At least, things are extremele tricky
> here.
>
> Nevertheless: Differential equations are not suitable for the Internet,
> neither is the Laplace Transform.
>
> It is funny how the reactions are when I only point to what everyone knows
> for decades: We worship a religion here.
>
--
Saverio Mascolo, Full Professor
Dipartimento di Elettrotecnica ed Elettronica
Politecnico di Bari
Via Orabona 4, 70125 Bari Italy
Tel. +39 080 5963621
Fax. +39 080 5963410
email:mascolo at poliba.it
http://c3lab.poliba.it
=================================
This message may contain confidential and/or legally privileged
information.
If you are not the intended recipient of the message, please destroy it.
Any unauthorized dissemination, distribution, or copying of the material in
this message, and any attachments to the message, is strictly forbidden.
More information about the end2end-interest
mailing list