TeXipedia

leftrightarrow

Represents a bidirectional arrow indicating equivalence, mutual implication, or two-way relationships between mathematical expressions.

Overview

Essential for expressing logical equivalence, biconditional statements, and reversible relationships in mathematics and formal logic.

  • Commonly used in mathematical proofs to show if-and-only-if conditions
  • Appears frequently in set theory to denote bijective mappings
  • Used in chemistry to represent reversible reactions or equilibrium
  • Important in formal logic for expressing material equivalence between propositions
  • Helpful in computer science for showing bidirectional data flow or mutual dependencies

Examples

Showing logical equivalence between two mathematical statements.

pqqpp \land q \leftrightarrow q \land p
p \land q \leftrightarrow q \land p

Representing a reversible chemical reaction.

H2+I22HIH_2 + I_2 \leftrightarrow 2HI
H_2 + I_2 \leftrightarrow 2HI

Indicating bidirectional mapping between sets.

f:ABf: A \leftrightarrow B
f: A \leftrightarrow B