(eplain.info)Equation reference hyperlinks

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5.3.7 Equation reference hyperlinks: eq
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All commands that define equation labels are part of the 'eq' destgroup.
These are '\eqdef', '\eqdefn', '\eqsubdef' and '\eqsubdefn' (Note:
Equation references). All these commands use the equation label as the
hyperlink label. However, if the equation label is empty, they make up a
(hopefully) unique hyperlink label for the destination. This label will
be used for the link when you refer to this empty-labeled equation with
one of the equation reference macros.

   The command '\phantomeqlabel' is called to generate hyperlink labels
for the empty-labeled equations. By default, it produces the labels in
the format 'PHEQNUMBER', where NUMBER comes from the count register
'\phantomeqnumber'; this count register is incremented at every
empty-labeled equation definition.

   The commands '\eqref' and '\eqrefn' (Note: Equation references)
form the 'eq' linkgroup. These commands take an optional argument,
which, when present, is tied with '\reftie' to the equation reference
and becomes part of the link. The equation label is used for the
hyperlink label; if the label is empty, the link is for the label
generated for the last empty-labeled equation.