西安毛子科技大枣三XIDIAN UNIVERSITY2、(引理2)设0fi(a)gi(a)A(a) =0f,(a)g2(a)0f2(a)gi(a)B(a) =0fi(a)g2(a)如果多项式 fi(a), f2(a)都与 gi(a),g2(a)互素,则A(a)与 B(a)等价.1 1 2 2 ( ) ( ) 0 ( ) 0 ( ) ( ) f g A f g          =       2 1 1 2 ( ) ( ) 0 ( ) 0 ( ) ( ) f g B f g          =       如果多项式 f f 1 2 ( ), ( )   都与 g g 1 2 ( ), ( )   互素， 2、(引理2) 设 则 A( )  与 B( )  等价