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I have two equations. [1a) and 1b)] And I want to refer these equations in a sentence as Eqn. (1). How can I do it? Thanks.

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    are you using amsmath? if so, see p.10, section 3.11.3 of the user's guide (`texdoc amsmath). it tells how to give a reference to the "parent" number of subequations. – barbara beeton Nov 3 '16 at 20:19
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If you add a label to the same line as \begin{subequations} you can reference that lable.

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    A slight nuance: the parent "label" doesn't have to be on the same line with \begin{subequations}. What's required is that the parent's \label be provided before some other counter (likely the equation counter) is incremented within the subequations environment. – Mico Nov 3 '16 at 21:33

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