.\" Complete independent document; no previous example is required.
.nr PO .5i
.nr LL 4.7i
.nr LT 4.7i
.nr HM .55i
.nr FM .55i
.nr PS 10
.nr VS 13
.ds RH GRF-09-003
.if n .ftr CR R
.pl 8.2677i
.\" BEGIN EXAMPLE
.TL
A small linear system
.LP
.ie n \{\
.LP
Linear system: 2x + y = 5; x + 3y = 7.
.\}
.el \{\
.EQ
left [ matrix { ccol { 2 above 1 } ccol { 1 above 3 } } right ]
left [ pile { x above y } right ] =
left [ pile { 5 above 7 } right ]
.EN
.\}
.\" END EXAMPLE
.br
.sp .4v
.nf
.ps 7
\f[CR]GRF-09-003\f[]
.fi