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Mathematics
Problem
For the matrix
A
=
(
a
1
1
1
b
1
1
1
2
)
A=\begin{pmatrix} a & 1 & 1 \\ 1 & b & 1 \\ 1 & 1 & 2 \end{pmatrix}
A
=
a
1
1
1
b
1
1
1
2
, derive the relation between
a
a
a
and
b
b
b
that makes
A
A
A
singular.
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