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⎡2<br />
⎢<br />
0<br />
⎢<br />
⎢⎣<br />
0<br />
A<br />
0 ⎤<br />
⎥<br />
− 3<br />
⎥<br />
0 ⎥⎦<br />
=<br />
⎡0<br />
⎢<br />
0<br />
⎢<br />
⎢⎣<br />
0<br />
A 1<br />
A = A 1 + A 2<br />
0 ⎤<br />
⎥<br />
− 3<br />
⎥<br />
0 ⎥⎦<br />
+<br />
⎡2<br />
⎢<br />
0<br />
⎢<br />
⎢⎣<br />
0<br />
A 2<br />
0⎤<br />
⎥<br />
0<br />
⎥<br />
0⎥⎦<br />
rg (A) = 2 ; rg(A 1 ) = rg(A 2 ) = 1