\EqcolonThe \Eqcolon symbol is used to denote a definition where the left-hand side is defined to be equal to the right-hand side. It is often used in mathematical texts to clarify that an equation is a definition rather than a statement of equality.
Defines 'a' as the sum of 'b' and 'c'.
a \Eqcolon b + cDefines the function f(x) as a quadratic expression.
f(x) \Eqcolon x^2 + 2x + 1Defines delta as the ratio of changes in y and x.
\delta \Eqcolon \frac{\Delta y}{\Delta x}