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The subequations environment provided by the amsmath package alters the numbering of equations within it to occur in a sequence such as (1a), (1b), .... This tag is not about general embedding of equations within other equations. It may be appropriate when applied to questions about other instances of this kind of sub-numbering of equation-like constructions, such as Sub-numbering equations within array, to which subsequations is not directly applicable.

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