: Re: What label to use in an article for a group of equations? Writing an academic paper, one might use different labels for different entities. For example in MS Word, Figure, Table, and Equation
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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