Further extensions of the real numbers under Hurwitzs theorem states that there are four normed division algebras: the real numbers 
  
    
      
        
          R
        
      
    
    {\displaystyle \mathbb {R} }
  , the complex numbers 
  
    
      
        
          C
        
      
    
    {\displaystyle \mathbb {C} }
  , the quaternions 
  
    
      
        
          H
        
      
    
    {\displaystyle \mathbb {H} }
  , and the octonions 
  
    
      
        
          O
        
      
    
    {\displaystyle \mathbb {O} }
  .
Epidemiology
The prevalence of biliary sludge is low in the general population. It has been reported that the prevalence ranges from 0-0.20% in men and 0.18-0.27% in women. However, in patients with certain conditions, the prevalence may be higher. See also
Biliary microlithiasis

References


== External links ==