FOR YOU TO DO

Let symbol be the set of symbols.
Specify the set (list-of symbol),
i.e., the set of lists of symbols.






	   FOR YOU TO DO

Given <symbol> and <number>,
write a grammar for <expression>
that includes the following examples:

	3
	x
	(5 + 4)
	(x + ((7 * 8) / y))
	(9 - z)


		FOR YOU TO DO

Consider the following grammar:

<expression> ::= <number> | <identifier>
	| ( lambda ( {<identifier>}+ )
		<expression> )
        | ( {<expression>}+ )

If the following are <expression>s,
then give a derivation,
else show why there is no derivation.

 a. x

 b. ((lambda (x) x) 3)

 c. f(3, 4)