THE BOUNDEDNESS OF SOLUTIONS OF LINEAR SYSTEMS (dy_i/dt)=sum from k=1 to 2 a_i,k(t)y_k,(i=1,2)

• 关于线性方程组(dy_i/dt)=sum from k=1 to 2 a_i,k(t)y_k,(i=1,2)解的有界性问题