The operational amplifier having the higher input potential will attempt to equalize its noninverting and inverting inputs by reducing current through resistor R5, but will fail to do so, since the diode connected to {HEAD ~ the operational amplifier} with {TAIL ~ the higher input signal} will become reversed biased and turn off, thereby blocking the output of that operational amplifier 
with
The operational amplifier having the higher input potential will attempt to equalize its noninverting and inverting inputs by reducing current through resistor R5 , but will fail to do so , since the diode connected to { HEAD ~ the operational amplifier } with { TAIL ~ the higher input signal } will become reversed biased and turn off , thereby blocking the output of that operational amplifier
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