I have the following commands to create 2 lines of equation. The first line contains 4 equations therefore it should be labeled as (1a-d). The second line contains 2 equations therefore it should be labeled as (1f-e). But since subequation has automatic labeling it ruins everything.

\refstepcounter{equation}\tag{\theequation a-d}\
\bar{\eta}_1(\frac{\mathcal{L}}{2}) = \bar{\eta}_3(0), \qquad \frac{\partial \bar{\eta}_1}{\partial X}(\frac{\mathcal{L}}{2}) = \frac{\partial \bar{\eta}_3}{\partial X}(0), \qquad \eta(\frac{\mathcal{L}}{2})=0, 
\refstepcounter{equation}\tag{\theequation e-f}\
\qquad \eta(0) = \bar{\eta}_1(0) = \frac{1}{2}.

Use \ref:


\newcommand{\pder}[2]{\frac{\partial #1}{\partial #2}}


Here are six equations grouped in a fancy way
\bar{\eta}_1\Bigl(\frac{\mathcal{L}}{2}\Bigr) = \bar{\eta}_3(0), \qquad
\pder{\bar{\eta}_1}{X}\Bigl(\frac{\mathcal{L}}{2}\Bigr) = \pder{\bar{\eta}_3}{X}(0), \qquad
\eta(0) = \frac{1}{2},\qquad
\bar{\eta}_1(0) = \frac{1}{2}, \qquad
and here is another, just to check that the numbering is in synch


enter image description here

| improve this answer | |
  • brilliant answer!! Thanks. However, no need to use \ref. one can manually add the equation number in \tag. – KratosMath Dec 11 '16 at 0:02

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