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Predicate Functions (cont.)

2. EQV? (atom equality) takes two symbolic parameters; it returns #T if both parameters are atoms and the two are the same

    (eqv? 'a 'a)        yields    #t 
    (eqv? 'a '(a b))    yields    ()

• EQV? is unreliable if used on lists

3. EQ? (pointer equality) is like EQV?, but is also unreliable on numbers, characters, and a few other special cases