The operational amplifier will continue to attempt to equalize its inputs until the voltage appearing at {HEAD ~ its output} is approximately equal to {TAIL ~ the output} of voltage source V+  
The operational amplifier will continue to attempt to equalize its inputs until the voltage appearing at { HEAD ~ its output } is approximately equal to { TAIL ~ the output } of voltage source V+
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH