6.3.6 Co/Monoids in $\textbf{Rel}$

The monoids in $\textbf{Rel}$ with respect to the Cartesian monoidal structure of Proposition 6.2.3.8.1 are called hypermonoids, and their theory is explored in . Similarly, the comonoids in $\textbf{Rel}$ are called hypercomonoids, and they are defined and studied in .


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