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SIMPLIFY: Results seem to depend on the form of the expression

• To: mathgroup at smc.vnet.net
• Subject: [mg26236] SIMPLIFY: Results seem to depend on the form of the expression
• From: Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil>
• Date: Wed, 6 Dec 2000 02:16:21 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

	To try to understand Mathematica better, sometimes I try some simple
things to see what happens etc...Here are some things I tried with Simplify
with the results depending on the form of the original expression even
though they are just simple polynomial expressions...

	(1)   a x + b x == c y+d y+g x+f x//Simplify

	returns

	   (a+b) x == f x +g x +(c+d) y         (* incomplete *)


	(2)  a x + b x - c y - d y == g x + f x//Simplify


	returns

	(a+b) x ==  (f+g) x + (c+d) y            (* seems to work *)


	(3)  a x + b x - g x -f x == c y + d y//Simplify

	returns

	(a+b-f-g) x == (c+d) y                   (* seems to work *)


	(4)  a x + b x - c y - d y - g x - f x == 0//Simplify

	returns

	(a+b) x == f x + g x +(c+d) y          (* incomplete *)


	(5) a x + b x -c y - d y - g x - f x//Simplify

	doesnt do anything to the expression..


	Should Simplify be this temperamental?  (FullSimplify handles all
these cases which is what I would have expected even from Simplify since
these are just simple polynomial expressions).

	thanks...Jerry Blimbaum    NSWC  Panama City, Fl