Try:
\placeformula[-]
\startformula
\left( {\matrix{
{a_1 } & {a_2 } & {a_3 } & \ldots & {a_X } \cr
{b_1 } & 0 & 0 & 0 & 0 \cr
0 & {b_2 } & 0 & 0 & 0 \cr
0 & 0 & \ddots & 0 & 0 \cr
0 & 0 & 0 & {b_{X - 1} } & 0 \cr
} } \right),
\stopformula
On Feb 19, 2007, at 2:24 PM, Vyatcheslav Yatskovsky wrote:
$$\left( {\matrix{
{a_1 } & {a_2 } & {a_3 } & \ldots & {a_X } \cr
{b_1 } & 0 & 0 & 0 & 0 \cr
0 & {b_2 } & 0 & 0 & 0 \cr
0 & 0 & \ddots & 0 & 0 \cr
0 & 0 & 0 & {b_{X - 1} } & 0 \cr
} } \right), $$
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