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January 28th, 2014, 07:24 AM  #1 
Senior Member Joined: Sep 2010 From: Germany Posts: 153 Thanks: 0  the zero set of an ideal
Given Find the zero set By definition : So I show that we must have and from this hence right? 
January 29th, 2014, 12:35 AM  #2 
Senior Member Joined: Mar 2012 Posts: 294 Thanks: 88  Re: the zero set of an ideal
It seems to me your zeroset is too small. For example, what about (0,0,c), (0,b,0) or (a,0,0)? Surely every element of J annihilates all of those.... 

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