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2-D polynomial matrices A(z 1 , z 2 ), B(z 1 , z 2 ) are called factor right (left) coprime if their greatest common right (left) divisor U(z 1 , z 2 ) (nonzero detU(z 1 , z 2 ) ∈ R). 2-D polynomial matrices A ∈ R p×m [ z 1 , z 2 ], B ∈ R p×m [ z 1 , z 2 ] (p+q ≥ m ≥ 1) are called zero right coprime if there exists a (z 1 , z 2 ) which is a zero of all m × m minors of the matrix h A B i . The minor co- primeness of two 2-D polynomial matrices coprimeness of 2-D polynomials a math- ematical relationship of interest in control A 2-D polynomial p (z 1 , z 2 ) = n 2 X i=0 a i (z 1 ) z i 2 = n 1 X j=0 a j (z 2 ) z j is called primitive if a i (z 1 ), i = 1, 2, . . . , n 2 and a j (z 2 ), j = 1, 2, . . . , n 1 are coprime (have not a common factor). Two primitive a (z 1 , z 2 ) = a n 1 (z 2 ) ¯a (z 1 , z 2 ) = a n 2 (z 1 ) ˆa (z 1 , z 2 ) b (z 1 , z 2 ) = b m 1 (z 2 ) ¯b (z 1 , z 2 ) = b m 2 (z 1 ) ˆb (z 1 , z 2 ) ¯a (z 1 , z 2 ) = z n 1 1 + ¯a n 1 −1 z n 1 −1 1 + · · · + ¯a 1 z 1 + ¯a 0 (¯a i = ¯a i (z 2 )) ˆa (z 1 , z 2 ) = z n 2 2 + ˆa n 2 −1 z n 2 −1 2 + · · · + ˆa 1 z 2 + ˆa 0 ˆa i = ˆa i (z 1 ) ¯b (z 1 , z 2 ) = z m 1 1 + ¯b m 1 −1 z m 1 −1 1 + · · · + ¯b 1 z 1 + ¯b 0 ¯b i = ¯b i (z 2 ) ˆb (z 1 , z 2 ) = z m 2 2 + ˆb m 2 −1 z m 2 −1 2 + · · · + ˆb 1 z 2 + ˆb 0 ˆb i = ˆb i (z 1 ) are factor coprime if and only if det ¯B n 1 + ¯a n 1 −1 ¯B n 1 −1 + · · · + ¯a 1 ¯B + ¯a 0 I m 1 6= 0 and det h ˆB n 2 + ˆa n 2 −1 ˆB n 2 −1 + · · · + ˆa 1 ˆB + ˆa 0 I m 2 i 6= 0 or det ¯A m 1 + ¯b m 1 −1 ¯ A m 1 −1 + · · · + ¯b 1 ¯ A + ¯b 0 I n 1 6= 0 and det h ˆ A m 2 + ˆb m 2 −1 ˆ A m 2 −1 + · · · + ˆb 1 ˆ A + ˆb 0 I n 2 i 6= 0 where ¯ A = 0 1 0 . . . 0 0 0 1 . . . 0 . . . . . . . . . . . . . . . 0 0 0 . . . 1 −¯a 0 −¯a 1 −¯a 2 . . . −¯a n 1 −1 ˆ A = 0 1 0 . . . 0 0 0 1 . . . 0 . . . . . . . . . . . . . . . 0 0 0 . . . 1 −ˆa 0 −ˆa 1 −ˆa 2 . . . −ˆa n 2 −1 ¯B = 0 1 0 . . . 0 0 0 1 . . . 0 . . . . . . . . . . . . . . . 0 0 0 . . . 1 − ¯b 0 − ¯b 1 − ¯b 2 . . . − ¯b m 1 −1 ˆB = 0 1 0 . . . 0 0 0 1 . . . 0 . . . . . . . . . , , , . . . 0 0 0 . . . 1 − ˆb 0 − ˆb 1 − ˆb 2 . . . − ˆb m 2 −1 coprocessor a processor that is connected to a main processor and operates concur- copy-back in cache systems an opera- tion that is the same as write-back—a write c 2000 by CRC Press LLC |