Definition:Basic Proposition

Definition
Let $f: \mathbb B^k \to \mathbb B$ be a boolean function, where:
 * $\mathbb B = \left\{{0, 1}\right\}$ is a boolean domain
 * $k$ is a nonnegative integer.

A basic proposition is one of the projection functions $\operatorname{pr}_j: \mathbb B^k \to \mathbb B$, defined as follows:

Let $X = \left({p_1, p_2, \ldots, p_k}\right) \in \mathbb B^k$.

Then $\operatorname{pr}_j \left({X}\right) = p_j$.

That is, a basic proposition is one of the elements of the $k$-tuple $\left({p_1, p_2, \ldots, p_k}\right)$.

Also see

 * Literal, which is the same thing from the perspective of propositional logic.