I'm sure this is a really bad idea, but I couldn't resist after finding section
3.3.8 in the Dr. Racket documentation - what fun :)
(define (∃ member list)
(cond [ (∅? list) ∅ ]
[ (≡ member (α list)) list ]
[ else (∃ member (ω list)) ]))
(∃ 8 '(3 9 8 5))
Using "alpha" for "car" kind of makes sense, but using "omega" for "cdr" really
doesn't - I expect it should return the last element of the list, but I
couldn't think of any greek symbol that might mean "tail".
I have been using Command-\ to insert λ instead of lambda. It's too pretty to
resist.
Brian
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