# I What δ means?

Tags:
1. Jul 19, 2016

### AleksanderPhy

Hello I have seen this symbol in many equations it looks like this:δΓ. I know that Γ means (that is Cristoffel symbol) but I don't know what δ means. Does anybody know?

2. Jul 19, 2016

Differential of a path function is δ....Differential of a state function is d....

3. Jul 19, 2016

### Quantum321

[1] " In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just positive integers. The function is 1 if the variables are equal, and 0 otherwise:
δ i j = { 0 if i ≠ j , 1 if i = j . {\displaystyle \delta _{ij}={\begin{cases}0&{\text{if }}i\neq j,\\1&{\text{if }}i=j.\end{cases}}} https://wikimedia.org/api/rest_v1/media/math/render/svg/904297d67d13919327bab9243517aef32e96c550
where the Kronecker delta δij is a piecewise function of variables i and j. For example, δ1 2 = 0, whereas δ3 3 = 1."
Note: this did not copy and paste properly. " {\displaystyle \delta _{ij}={\begin{cases}0&{\text{if }}i\neq j,\\1&{\text{if }}i=j.\end{cases}}}" See the referenced link.

1. https://en.wikipedia.org/wiki/Kronecker_delta

4. Jul 19, 2016

but i m sure differential of path function is also δ

5. Jul 19, 2016

### weirdoguy

It has several meanings, like any other symbol used in maths.

6. Jul 19, 2016

hmmm...thats it....its quite confusing.....

7. Jul 19, 2016

### AleksanderPhy

Many thanks I thought so that it was Kronecker delta

8. Jul 19, 2016

### Orodruin

Staff Emeritus