6. Function Definition: use the format f: D→ R, define D and R verbally (e.g. 'D = the set of all dogs') (a) Define a function peer group (assume there is only one peer group per individual): pg : ... (b) Define a function sum-of-age that maps a group of people to the sum of their ages (no computation involved, only the sets and core definition are required!) sa : ... (c) Define two functions and compose them: f: maps a book to its author g: maps a person to their age Are f and g a total or a partial function respectively?

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