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currently composing a lecture on Association Rule Mining, Frequent Item sets.

Therefore I need to formally describe the count function of the support measure as occurring int the following forumula :

The count function counts the number of cases where the item set X is a subset of a transaction t occurring in the set of all transactions T

Now my question, can I mathematically (formally) describe the sentence above using the following notation?

Or if not, what would be the correct way to express this? I'm a bit concerned because "there exists" rather evaluates to Boolean and not to integer...

Thanks a lot!

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1 Answer 1

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Just asked a mathematician and this seems to be correct:

enter image description here

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