(see factorial)Normally dots should be used only where the pattern to be followed is clear, the exception being to show the indefinite continuation of an irrational number such as:

  
    
      
        π
        =
        3.14159265
        …
      
    
    {\displaystyle \pi =3.14159265\ldots }
  Sometimes, it is useful to display a formula compactly, for example:

  
    
      
        1
        +
        4
        +
        9
        +
        ⋯
        +
        
          n
          
            2
          
        
        +
        ⋯
        +
        400
      
    
    {\displaystyle 1+4+9+\cdots +n^{2}+\cdots +400}
  Another example is the set of positive zeros of the cosine function:

  
    
      
        
          {
          
            
              
                π
                2
              
            
            ,
            
              
                
                  3
                  π
                
                2
              
            
            ,
            
              
                
                  5
                  π
                
                2
              
            
            ,
            …
          
          }
        
      
    
    {\displaystyle \left\{{\frac {\pi }{2}},{\frac {3\pi }{2}},{\frac {5\pi }{2}},\ldots \right\}}
  There are many related uses of the ellipsis in set notation.
HPC is also used as a lubricant for artificial eyes. HPC is used as a thickener, a low level binder and as an emulsion stabiliser with E number E463. In pharmaceuticals it is used as a binder in tablets. HPC is used as a sieving matrix for DNA separations by capillary and microchip electrophoresis.HPC is the main ingredient in Cellugel, which is used in book conservation. Cellugel is described as "A safe, penetrating consolidant for leather book covers affected by red rot" and is produced by Preservation Solutions. See also
Carboxymethyl cellulose
Methyl cellulose
Hypromellose


== Notes and references ==