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A set is a collection of objects, denoted by $S = {a_1, a_2, ..., a_n}$, where $a_i$ are the elements of $S$.

However based on general Discrete Mathematics concepts here some possible fixes:

The union of two sets $A$ and $B$, denoted by $A \cup B$, is the set of all elements that are in $A$ or in $B$ or in both. The intersection of two sets $A$ and $B$, denoted by $A \cap B$, is the set of all elements that are in both $A$ and $B$.

Propositional logic is a branch of logic that deals with statements that can be either true or false. Propositional logic is used extensively in computer science, as it provides a formal framework for reasoning about Boolean expressions and logical statements.

A set $A$ is a subset of a set $B$, denoted by $A \subseteq B$, if every element of $A$ is also an element of $B$.

A proposition is a statement that can be either true or false.

Proof techniques are used to establish the validity of mathematical statements. In computer science, proof techniques are used to verify the correctness of algorithms, data structures, and software systems.

A graph is a pair $G = (V, E)$, where $V$ is a set of nodes and $E$ is a set of edges.