While studying eqn.y I've just discovered some features of GNU eqn which
appear to be undocumented in eqn.man.
. `undef' undefines a macro.
. `copy' is a synonym for `include'.
. `Alpha', `Beta', etc., is the same as `ALPHA', `BETA', etc.
. GNU eqn has two more predefined operators: `ldots' (three dots on
the base line) and `dollar'.
. The keyword `space' sets the vertical spacing (in hundredths of em),
normally before and after an equation. It provides an interface to
groff's \x escape but with opposite sign: positive values change the
space before the equation line, negative values change the space
after the equation line.
.EQ
space 50
a = b + c
space -300
.EN
. The keywords `lcol' and friends can be immediately followed by a
number which gives increases the vertical spacing of rows in
hundredths of ems:
.EQ
matrix {
ccol 100 { a above b above c }
ccol { d above e above f }
}
.EN
Since this vertical spacing is realized with \x also, it interferes
with the `space' command described above.
. The same is true for `lpile' and friends.
Werner
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