The logical connective "IF-THEN" is also known as:a.Conjunctionb.Disjunctionc.Negationd.Implication

The logical connective "IF-THEN" represents a conditional statement that connects two propositions in a way that expresses a dependency between them.

1. Understanding Logical Connectives: Logical connectives are used in propositional logic to form compound statements from simpler ones. The main types include conjunction (AND), disjunction (OR), negation (NOT), and implication (IF-THEN).

2. Definition of Implication: The "IF-THEN" statement is specifically known as an implication. In logical terms, if we denote two propositions as $P$ and $Q$, the statement "IF $P$ THEN $Q$" is represented as $P \implies Q$. This means that if $P$ is true, then $Q$ must also be true.

3. Examining the Options:

   • a. Conjunction: Represents the logical AND, which is true only if both propositions are true.
   • b. Disjunction: Represents the logical OR, which is true if at least one of the propositions is true.
   • c. Negation: Represents the logical NOT, which negates the truth value of a proposition.
   • d. Implication: Represents the logical IF-THEN, which is true unless a true proposition leads to a false one.

4. Conclusion: By analyzing the definitions, it is clear that the "IF-THEN" logical connective is best represented by "Implication."

Final Answer

The logical connective "IF-THEN" is also known as d. Implication.