# Kronecker Delta

### From Conservapedia

The **Kronecker Delta** δ_{ij} satisfies the following property:

where *i* and *j* are integers. For a summation:

- .

The elements of the identity matrix can be seen as following Kronecker Delta (i.e, (*I*)_{ij} = δ_{ij}). To see this, let *A* be an nxn matrix, *a*_{ij} be its elements and *I* be the nxn identity matrix. Then *A* = *A**I* so,

where the definition of matrix multiplication and the above property of summation was used.

The continuous analogue of Kronecker Delta is Dirac delta.

## References

Weisstein, Eric W. "Kronecker Delta." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/KroneckerDelta.html