What Is Math Delta?

Delta is a mathematical symbol that is often used in maths to represent a number, function, set, or equation. Depending on the field of study, it can have a wide range of meanings and applications. 

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Lower-case Delta (d) represents an angle in any geometric shape. This is because geometry has its roots in the work of Euclid, who marked his angles with Greek letters. 

A Lower-case Delta has a More Specific Function in Advanced Mathematics

The delta of a function is a measure of infinitesimal changes to one of its variables. This is a mathematical concept called the derivative, and the roman letter d is the king of the hill when it comes to representing this. 

Uppercase Delta has a More Specific Function in Algebra

The upper-case delta is a bit more elusive, but it does make the cut when it comes to representing a mathematical concept that is actually used in the real world. Its most notable usage is in the discriminant of a polynomial equation, particularly the quadratic. The discriminant, for instance, will look something like this: D = b2 – 4ac.