I doubt if I am the first person to ask this question, but I have not seen an "answer" in any of the ML books I have read yet...
Is there a way to represent a "set of sets" so that a function can process a query such as " is [2] an element of [ 3 , [2], 4, 5]?" I know we can easily do a query such as " is 2 an element of [ 3 , 2, 4, 5]?" I know the problem is that lists cannot have different types, but this is a common, normal query in mathematics so someone must have figured out a way to do it perhaps? -Dave
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