Symbols:Greek/Sigma

Event Space

 * $\Sigma$

The $\LaTeX$ code for $\Sigma$ is \Sigma.

Sum Notation
The $\LaTeX$ code for $\displaystyle \sum_{j=1}^n a_j$ is \displaystyle \sum_{j=1}^n a_j.

The $\LaTeX$ code for $\displaystyle \sum_{1 \le j \le n} a_j$ is \displaystyle \sum_{1 \le j \le n} a_j.

The $\LaTeX$ code for $\displaystyle \sum_{\Phi \left({j}\right)} a_j$ is \displaystyle \sum_{\Phi \left({j}\right)} a_j.

Surface Charge Density

 * $\sigma$

Used to denote the surface charge density of a given body:
 * $\displaystyle \sigma = \frac q A$

where:
 * $q$ is the body's electric charge;
 * $A$ is the body's area.

The $\LaTeX$ code for $\sigma$ is \sigma.

Area Density

 * $\sigma$

Used sometimes, although $\rho_A$ (Greek letter rho) is more common, to denote the area density of a given two-dimensional body:
 * $\displaystyle \sigma = \frac m A$

where:
 * $m$ is the body's mass;
 * $A$ is the body's area.

The $\LaTeX$ code for $\sigma$ is \sigma.