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LM258作为电压跟随器的疑问

Other Parts Discussed in Thread: LM258

我想问一下LM258在这个电路里是电压跟随器吗?R4在这里不影响输出电压吗?根据虚短的原理,V-是等于Vref。

那么Vo和V-的关系怎么分析呢,是相等吗?怎么根据虚断的原理分析Vo和V-的关系?这里是怎么得到Vo=V-的呢?