Holistically, there are four elementary arithmetic operations in mathematics: addition (+), subtraction (−), multiplication (×), and division (÷); and four basic number systems, the real numbers 
  
    
      
        
          R
        
      
    
    {\displaystyle \mathbb {R} }
  , rational numbers 
  
    
      
        
          Q
        
      
    
    {\displaystyle \mathbb {Q} }
  , integers 
  
    
      
        
          Z
        
      
    
    {\displaystyle \mathbb {Z} }
  , and natural numbers 
  
    
      
        
          N
        
      
    
    {\displaystyle \mathbb {N} }
  .
Centrifugal abdominal lipodystrophy is a skin condition characterized by areas of subcutaneous fat loss that slowly enlarge. : 496–7

See also
Lipodystrophy
List of cutaneous conditions
Skin lesion


== References ==