For example, when calculating V+ and V-

V+ = ( Voutputhigh - Vref ) . R1/R2 + Vref

V- = ( Voutputlow - Vref ) . R1/R2 + Vref

**What is happening in this equation?**

Another question

Is R1/R2 equal to β?

I thought the gain of an ideal op amp was infinite, so why do we calculate β?

Any help would be greatly appreciated,

Thanks