The Evolution of Language
-------------------------


Descartes:

	2x



Church:

	\x.2x



McCarthy:

	(LAMBDA (X) (* 2 X))



W3C:

	<?xml version="1.0"?>

	<LAMBDA­TERM>

		<VAR-LIST>
			<VAR> X </VAR>
		</VAR­LIST>

		<EXPR>
			<APPLICATION>
				<EXPR> <CONST> * </CONST> </EXPR>

				<ARGUMENT­LIST>
					<EXPR> <CONST> 2 </CONST> </EXPR>
					<EXPR> <VAR> X </VAR> </EXPR>
				</ARGUMENT­LIST>
			</APPLICATION>
		</EXPR>
	</LAMBDA­TERM>