Question about a simple inverting Opamp

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windmillkity

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What is the difference between (a) and (b)? (Opamps are ideal)
Thx.
 

The first configuration works as typical inverting amplifier with negative feedback, the second one works like comparator with a histeresis .. see attached desription ..
More details on both configuration can be found at:
**broken link removed**

Regards,
IanP
 
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