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April 21st, 2013, 01:34 PM  #1 
Senior Member Joined: Aug 2011 Posts: 149 Thanks: 0  On which conditions are planes parallel?
Could anyone tell me how I could find out on which conditions planes a1x+b1y+c1z+d = 0 and a2x+b2y+c2z+d2 = 0 dont have common points? Logic tells me that planes dont have common points when they are parallel. If I am not mistakesn planes are parallel if and only if their normals are parallel but how do I set conditions. I mean how would this exact equation/equation system look like? Or what do I need to do with that problem? 
April 21st, 2013, 02:09 PM  #2 
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: On which conditions are planes parallel? 
April 21st, 2013, 04:39 PM  #3  
Senior Member Joined: Feb 2010 Posts: 706 Thanks: 140  Re: On which conditions are planes parallel? Quote:
 

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