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I have seen this question :

enter image description here

At the comment asked about :

Is this "information theory" or "systems theory"? – The Photon

So i liked to know why this comment asked? Why the system theory vs information theory

I am newbie about this topic and asked here for better saving time and ... 

Thanks for your attention. 

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  • $\begingroup$ Please link to the question instead of just posting a screenshot. $\endgroup$ – Marcus Müller Dec 30 '19 at 10:52
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Yes that's most probably a typo; it's the system theory which deals with the concept of linearity, causality, etc.

Linear system theory deals with characterisations of systems in terms of its input-output relationship through applied signals. It describes how to compute the output in time and frequency domains as well as characterises systems according to their properties such as linearity, stability, causality etc.

Information theory deals with quantification of information (called as the entropy) contained within a source according to either its observed output (via statistical computation) or to its descriptive model (via probabiitistic computation).

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