[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]

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


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