Math experts show new stamp is sum total of excellence
    
        
    
      
    
      
    
        
          By Lin Qi | 
          chinadaily.com.cn |
          Updated: 2025-03-14 15:47
          
          
          
          
        


        
      
    
      
    
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   The four stamps, issued by China Post, each depicts pi the mathematical constant, the Pythagorean theorem, Euler's formula and Mobius strip. [Photo by Jiang Dong/China Daily] 
 
     

     

        
    

        
        
      
    
        
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