# Group index

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> Markdown URL: https://mediated.wiki/source/Group_index.md
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> Source revision: 1356678796
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**Group index** may refer to:

- The [refractive index of a group velocity](/source/Refractive_index#Group_index) in optics
- the [index of a subgroup](/source/Index_of_a_subgroup) in mathematics
- The [Zagreb index](/source/Zagreb_index), a topological index in graph theory, sometimes called the Zagreb group index.

## See also

- [Index group](/source/Index_group)

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Adapted from the Wikipedia article [Group index](https://en.wikipedia.org/wiki/Group_index) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Group_index?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.