From toida@cs.odu.edu Fri Sep 17 17:15:57 1999
Date: Fri, 17 Sep 1999 17:09:36 -0400 (EDT)
From: S. Toida 
To: cboyd001@odu.edu, grbvelarde@earthlink.net, gvelarde@emh.qedsysinc.com,
     halford@cs.odu.edu, hillsbells@hotmail.com, jhard001@odu.edu,
     johnsonb@tez.net, lan_j@cs.odu.edu, mcghee@cs.odu.edu, nathan@netscope.net,
     nkeen001@odu.edu, Oly1@worldnet.att.net, shaunc@rica.net,
     tallison@hrnc.com,craig.todd@bankofamerica.com
Subject: Re: hws 




> Dr. Toida,
> 
> I have reviewed your comments on the homeworks for cs395.  I have a couple of
> questions, though.
> 
> Your message indicated that the point distribution question 2 is 18 points; I
> assume (perhaps incorrectly) that each of the 6 parts to the question are 3
> points each.  However, you marked my 8f incorrect (presumably 3 points off),
> but I only got 12 points for the question.  Is each part of question 8 weighted
> differently?

	Yes. See my e-mail "hw1&2"

> 
> My other question may (hopefully) make the above question moot.  For 8f, x + y
> = y + z if x = z, my answer was that this is a true proposition.  In marking
> this wrong you stated that we don't know the values of x,y,z.  However if x =
> z, then the equation could also be written z + y = y + z.  In this case,
> regardless of the values of y and z (and x), the statement is always true.  As
> question 8e indicates a value for x to make the statement a false proposition,
> I would think 8f would be treated similarly.  Furthermore, in question 7 (I
> think, I don't have my book with me), there is an almost identical statement (y
> + z = z + y, I believe).  The answer book treats this as a true proposition as
> it is always a true statement regardless of the value.
> 

	I said "what x,y,z represent". They may not represent a number.
	For example they may represent books or cars. If that is the case,
	then "x+1", "x+y" etc. would not make any sense.


> Please let me know if my thinking is correct and my answer can be considered
> correct.  Thank you!
> 	

	These are tricky questions. So don't feel too bad for missing 
	them.

	Toida