Symbol Description

N	Population size or number of nodes in a network.
v	Node of interest.
C_D	Degree centrality of a network.
C	Closeness centrality.
d	Distance between x and y vertices.
t	Time.
x	State vector.
y	Output vector.
u	Control vector.
A	System matrix in state space representation.
B	Input matrix in state space representation.
C	Output matrix in state space representation.
D	Feedback or feed-forward matrix in state space representation.
I	Ignorant class for information spread.
S	Spreading class for information spread.
R	Recovered class for information spread.
C	Counter-spreading class for information spread.
E	Exposed class for epidemic spread.
β	Spreading rate.
γ	Stifling rate.
δ	Decay rate in information interest.
α	Counter-spreading rate.
μ	Counter-stifling rate.
ω	Willingness of spreaders to listen to counter-spreaders (receptivity rate).
σ	Stochastic element of a system ( $\sqrt{b (S) + d (S)}$ ).
k	Average connectedness factor.
d	Strength of information influence factor.
R₀	Basic reproduction number: Average number of secondary infections from a single infected individual ( $\frac{β}{γ}$ ).
W	Wiener process.
K	Control gain.
L	Luenberger observer gain.
e	Error function.
J	Performance measure.
$H$	Hamiltonian.
u*	Optimal control.
λ	Time to be optimized.

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Symbols

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