Test equation tagging and referencing [uts-000B]
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    Inspired by thosgood/fga.

    The following is an equation:

    Eq 1.  [math-eq-1.1]

      \[E = m c^2 \tag{math-eq-1.1}\]

      Eq.  [eqid]

        \[E = m c^2 \tag{1.2}\]

        Eq.  [eqid2]

          \[E = m c^2 \tag{1.3}\]

          Eq 2.  [math-eq-1.4]

            \[E = m c^2 \tag{math-eq-1.4}\]

            Now we refer to Eq 1, Eq [eqid].