Hi
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I just want to confirm a concept. In a 2-d list each list in it is treated as an element of that 2-d list. So infinity norm of a 2-d list will be equal to absolute sum of that list(element) whose sum is maximum ?? here by element I mean each list which is present in a 2-d list. 
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what’s the infinity norm in a 2-d matrix, maximum of the sum along the columns or maximum of the sum along the rows ? 
 
      
    
