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## What is the Dirac delta function equal to?

In mathematics, the Dirac delta distribution (δ distribution), also known as the unit impulse symbol, is **a generalized function or distribution over the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one**.

## Is the Dirac delta function real?

The Dirac Delta function is **not a real function** as we think of them. It is instead an example of something called a generalized function or distribution.

## Why Dirac delta function is used?

The Dirac delta function is used **to get a precise notation for dealing with quantities involving certain type of infinity**. More specifically its origin is related to the fact that an eigenfunction belonging to an eigenvalue in the continuum is non- normalizable, i.e., its norm is infinity.

## What is the difference between Dirac delta and Kronecker delta?

Kronecker delta δij: Takes as input (usually in QM) two integers i and j, and spits out 1 if they’re the same and 0 if they’re different. Notice that i and j are integers as such are in a discrete space. Dirac delta distribution δ(x): Takes as input a real number x, “spits out infinity” if x=0, otherwise outputs 0.

## Why Dirac delta is not a function?

Because, strictly speaking, **the Dirac Delta does not satisfy the definition of a function**. (Which is: A function is a set of ordered pairs, no two of which have the same first element.) Any non-equivalent definition leads to either incorrectness or unnecessary complexity in descriptions.

## What is Dirac delta function in Laplace?

In general the inverse Laplace transform of F(s)=s^n is 𝛿^(n), the nth derivative of the Dirac delta function. This can be verified by examining the Laplace transform of the Dirac delta function (i.e. the 0th derivative of the Dirac delta function) which we know to be **1 =s^0**.