Patent ID: 8412743
Filing Date: 2013-04-02
Classification: G06F,Y10S

Abstract:
1. A method for categorizing information items using a hierarchical structure of nodes, wherein each information item is represented by a leaf node and each category is represented by a non-leaf node in said hierarchical structure, comprising: associating a first number with each node, wherein for each non-leaf node said first number is uniquely selected from a subset of relatively prime elements within a unique factorization domain, wherein said subset of relatively prime elements includes at least one nonprime element, wherein elements of said subset of relatively prime elements taken pairwise are all relatively prime to each other, and wherein for each leaf node said first number is equal to one; and associating a second number with each node, wherein for each root node said second number is equal to said first number, wherein for each non-root node said second number is equal to a product of said second numbers associated with each direct parent node of said non-root node and said first number of said non-root node, and wherein at least one non-root node has multiple direct parents, said second number for said at least one non-root node being equal to a product determined from multiplying said second numbers belonging to each of said multiple direct parents and said first number of said at least one non-root node.