Sigma notation

Sigma notation may refer to,

In mathematics, summation notation
In material science, crystal reciprocal density "Σ" notation. ^[1]

References

^ Randle, Valerie (2011). "The coincidence site lattice and the 'sigma enigma'". Materials Characterization. 47: 411–416.

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[1] Randle, Valerie (2011). "The coincidence site lattice and the 'sigma enigma'". Materials Characterization. 47: 411–416.

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