\coloneqThe symbol \coloneq is used to denote a definition or assignment, meaning that the expression on the left-hand side is defined to be equal to the expression on the right-hand side. It is often used in mathematical texts to introduce new variables or functions.
Defines the variable x to be equal to 5.
x \coloneq 5Defines the function f(t) as a quadratic expression.
f(t) \coloneq t^2 + 3t + 2Defines the set A to contain the elements 1, 2, and 3.
A \coloneq \{1, 2, 3\}