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Conjunction — Definition, Formula & Examples

Conjunction

A statement which connects two words or statements using the word and. For example, "peas and carrots" is a conjunction.

See also

Disjunction

Key Formula

p∧qp \wedge q
Where:
  • pp = The first statement (or proposition)
  • qq = The second statement (or proposition)
  • ∧\wedge = The logical "and" symbol, read as "and"

Worked Example

Problem: Let p be "5 is odd" and q be "8 is even." Determine whether the conjunction p ∧ q is true or false.
Step 1: Evaluate statement p: Is 5 odd? Yes, so p is true.
p=Truep = \text{True}
Step 2: Evaluate statement q: Is 8 even? Yes, so q is true.
q=Trueq = \text{True}
Step 3: A conjunction is true only when both parts are true. Since both p and q are true, the conjunction is true.
p∧q=Truep \wedge q = \text{True}
Answer: The conjunction "5 is odd and 8 is even" is true.

Why It Matters

Conjunctions are fundamental in logic and programming. Conditional statements like "if you are 16 and you have a license, then you may drive" require both conditions to hold. Understanding how "and" works logically helps you evaluate truth in proofs, set theory, and computer code.

Common Mistakes

Mistake: Confusing conjunction (and) with disjunction (or). Students sometimes think a conjunction is true when at least one part is true.
Correction: A conjunction requires both statements to be true. If even one statement is false, the entire conjunction is false. The "at least one true" rule applies to disjunction (or), not conjunction.

Related Terms