Moves the definition of Flatten(..) and Card(..) #135
Merged
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The functions Flatten(..) and Card(..) are currently defined at the end of Sec.18.5.1 Aggregate Algebra, directly before Sec.18.5.1.1 Set Functions. There is no explanation why these functions are needed.
Since the main purpose of these functions is to be helper functions that are used for defining the set functions in Sections 18.5.1.2 to 18.5.1.8, I find it much more natural to introduce these two functions in Sec.18.5.1.1 Set Functions.
Hence, this PR moves the definitions of these two functions into Sec.18.5.1.1 Set Functions and adds a sentence that introduces the purpose of these two functions.
Additionally, the PR improves the readability of the definition of Flatten.
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