\LongleftrightarrowThe \Longleftrightarrow symbol is used in mathematical expressions to denote logical equivalence or a biconditional relationship between two statements. It indicates that both statements are true or both are false, establishing a two-way logical connection.
Logical equivalence between statements A and B
A \Longleftrightarrow BBiconditional relationship showing that x equals 2 if and only if x squared equals 4
x = 2 \Longleftrightarrow x^2 = 4Chain of logical equivalences among statements P, Q, and R
P \Longleftrightarrow Q \Longleftrightarrow R