(eplain.info)Displays

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4.4 Displays
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By default, TeX centers displayed material. (Displayed material is just
whatever you put between '$$''s--it's not necessarily mathematics.) Many
layouts would be better served if the displayed material was
left-justified. Therefore, Eplain provides the command '\leftdisplays',
which indents displayed material by '\parindent' plus '\leftskip', plus
'\leftdisplayindent'.

   You can go back to centering displays with '\centereddisplays'. (It
is usually poor typography to have both centered and left-justified
displays in a single publication, though.)

   '\leftdisplays' also changes the plain TeX commands that deal with
alignments inside math displays, '\displaylines', '\eqalignno', and
'\leqalignno', to produce left-justified text. You can still override
this formatting by inserting '\hfill' glue, as explained in 'The
TeXbook'.

   Eplain defines '\eqnum' and '\eqalignnum' which can be set up to
produce either left-aligned or right-aligned equation numbers.
'\lefteqnumbers' ('\righteqnumbers') will define '\eqnum' to expand to
'\eqno' ('\leqno'), and '\eqalignnum' to expand to '\eqalignno'
('\leqalignno'). Default is '\righteqnumbers' (right-aligned equation
numbers).

Formatting displays

General formatting of displays.