  
 Sturm sequences   
 
    1.   
    2.   
    4.   
    18.  
    86.  
 
 Number of eigen values strickly greater than 0 :    
 
    4.  
 
 Sturm sequences   
 
    1.   
  - 3.   
  - 31.  
  - 97.  
    31.  
 
 Number of eigen values strickly greater than 5 :    
 
    2.  
 
 Number of eigen values between 0 and 5 :    
 
    2.  
 