sigma

(noun)

The symbol $\Sigma$, used to indicate summation of a set or series.

Related Terms

  • summation
  • vector

Examples of sigma in the following topics:

  • Series and Sigma Notation

    • Sigma notation, denoted by the uppercase Greek letter sigma $\left ( \Sigma \right ),$ is used to represent summations—a series of numbers to be added together.
    • One way to compactly represent a series is with sigma notation, or summation notation, which looks like this:
    • The main symbol seen is the uppercase Greek letter sigma.
  • Solving Problems with Logarithmic Graphs

    • In the equation mentioned above ($j^*= \sigma T^4$), plotting $j$ vs.
    • Taking the logarithm of each side of the equations yields: $logj=log{(\sigma\tau ) }^4 $.
    • $\begin{aligned} \log j&=4\log{(\sigma\tau ) } \\ &=4\log{(\sigma)}+4\log{(\tau ) } \\ &=4\log{(\tau ) }+4\log{(\sigma)} \end{aligned} $
  • Sums and Series

    • The notation for this operation is to use the capital greek letter sigma, $\Sigma$, following the general formula:
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