<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.6000.16809" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Courier New" size=2>As far as I know the concept of `consant' is not defined in scheme. But 1 and 55 definitiley are (representations of) values (in fact self evaluating values, that is to say, the value of 55 is 55, whereas the value of say 'a-variable-name' can be anything from undefined to a very well defined value)</FONT></DIV> <DIV><FONT face="Courier New" size=2>Jos</FONT></DIV> <DIV><FONT face="Courier New" size=2></FONT> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=adityashukla1983@gmail.com href="mailto:adityashukla1983@gmail.com">aditya shukla</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=jos.koot@telefonica.net href="mailto:jos.koot@telefonica.net">Jos Koot</A> </DIV> <DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=plt-scheme@list.cs.brown.edu href="mailto:plt-scheme@list.cs.brown.edu">plt-scheme@list.cs.brown.edu</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 13, 2009 9:32 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [plt-scheme] Understanding lambda</DIV> <DIV><BR></DIV>Thanks for the help guys , so now i know that  in (define f (lambda(x) (+(* 3 x) 5)))  value of f is a function returned by the lambda expressions.so when i do ( f 1)  or anything as in (f 55) then what are 1 or 55  in this expression , constants or functions?<BR><BR><BR>Aditya<BR></BLOCKQUOTE></BODY></HTML>