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Re^2: The intersection of M hyperplanes (Ndim)by bliako (Abbot) 
on Jul 18, 2024 at 15:59 UTC ( [id://11160684]=note: print w/replies, xml )  Need Help?? 
glad for that flashback So, I understand that if a1=0 and a2=0 then the vectors are "parallel on that axis", and so I proceed to check the other coefficients in order to determine if the planes are parallel. If one of a1 OR a2 is zero then I conclude the vectors (and the planes) are not parallel and the test can stop right there.
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