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Generally speaking, what is the difference between the 'x' and the 'plus' symbol in a closed loop block diagram?

For example, in enter image description here (https://ieeexplore.ieee.org/document/6983570)

, what's the difference between the 'cross' sign and the 'plus' sign?

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    \$\begingroup\$ The same as between + and x operators in math (note though that multiplication in Laplace domain is a convolution in time domain). \$\endgroup\$ – Eugene Sh. Mar 20 '19 at 15:52
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The 'x' symbol you show refers to multiplication, its output is \$B\delta\$.

The '+' symbol you show refers to addition, the one on the left outputs \$P^*-P\$.

From the reference you provided, I understand this is given in time domain.

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    \$\begingroup\$ +1 but be careful, this might be in the Laplace domain so the multiplication could be convolution due to the properties of multiplication in the Laplace domain :) \$\endgroup\$ – user103380 Mar 20 '19 at 16:02

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