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Writing an academic paper, one might use different labels for different entities. For example in MS Word, Figure, Table, and Equation might be used for figures, tables, and math equations, respectively. Equation labels are typically placed to the right side of the equation.
What label should I use for a group of equations? Can I use equations (for example equations (15))?
Update:
Here is an example group of equations from a mechanics-related text, where different parameters of a criterion are calculated in a series of equations. what do we call such a group as a label (e.g. [label] 7)?
In this study, Mohr-Coulomb criterion has been selected in this study as the fracture criterion. Parameters of this criterion are calculated corresponding to [label]s(?) 7 to 9.
(2)More posts by @Nimeshi163
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Assuming that the equations have a relationship (such as all describing different properties of the same process) they are a set of equations, but the question is are they a named set? If they are a named set, use their name, otherwise you should label them.
A common way to number a group of equations is to use a single number for the whole group and lower-case letters to identify the different equations (subequations). For example, the above equations can be numbered (7a), (7b), (7c) and (7d). You can then refer to each single equation (e.g. "Equation (7a) yields...") or to the whole group (e.g. "The set of equations (7) represents..."). The choice depends on your needs. In the example you provided, probably, the author did not need to refer specifically to any of the subequations.
If you are using LaTeX to typeset your document, the amsmath package defines the subequations environment for this purpose.
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