We want to construct a database describing the fictional genres my friends like.

| February 14, 2018

We want to construct a database describing the fictional genres my friends like. Alex likes mystery and horror, Bobby likes crime and science fiction, Carol likes mystery, science fiction and horror, and Dan likes crime. Denoting by F the set of my friends, and by G the set of genres (a) Give the relation R on F×G which represents this information. (You may use appropriate abbreviations.) (b) Find the operation involving projection and inverse projection maps which find the genres that Ale …

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