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Complete Factorization?

• To: mathgroup at smc.vnet.net
• Subject: [mg7128] Complete Factorization?
• From: skipper at worldnet.att.net (Thomas Skipper)
• Date: Sun, 11 May 1997 02:57:25 -0400 (EDT)
• Organization: AT&T WorldNet Services
• Sender: owner-wri-mathgroup at wolfram.com

Does anyone know why MMA would not be able to completely factor this:
2xy-4y^2?
MMA will only factor out the 2, not the reamaining y, and consistently
leaves only 2(xy-2y^2) Is there a reason why it won't completely
factor this to 2y(x-2y)? The MMA book says that "Factor" performs a 
"complete" factorization, but obviously that is not the case.
Iguess the main question is, will MMA completely factor a polynomial
or not, and if so, what is the command that WILL perform a complete
factorization?