Recognizing the linear equations shown above as the normal equations, it follows that {HEAD ~ the solution w} is {TAIL ~ the vector} that minimizes J: 
Recognizing the linear equations shown above as the normal equations , it follows that { HEAD ~ the solution w } is { TAIL ~ the vector } that minimizes J :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH