00191828-01.pdf - 第57页

 W , , W                            =       



W ,,W

 ,&

,&         

        

           

         

    ,&    

 

  ,&

   [



    

 

  

    

 

        



 [   

 [   

 

 





[[     

    



       





      



  



  

 





 ' 

 σσσ

  σ σ σ



W ,,W

       





  

    





    

  =



     



W ,,W

   

  59    

 59       

           [ 

         

    59      

       

      

  

 





 [   [





 = 

   

  

 σσσ

     



 σ σ σ