Definition:Singular Boolean Function

Definition
A singular boolean function $$s : \mathbb B^k \to \mathbb B$$ is a boolean function whose fiber of truth is a single element of $$\mathbb B^k$$.

Where the boolean domain $$\mathbb B = \left\{{T, F}\right\}$$ is given a logical interpretation, a singular boolean function is called a singular proposition.

That is, a singular proposition $$P$$ is one in which there exists only one model $$\mathcal M \models P$$.