I agree that the definition of solvency is wrapped up in the value of the assets, which can be difficult to assess. That's why I said "The Fed /believed/ that the value of AIGs assets were greater than its liabilities" [emphasis added]. That being said, I think we can agree this has very little to do with fractional reserve banking as a concept. To put it simply, you can only have insolvent banks in a fractional reserve system, but a fractional reserve system doesn't necessitate insolvency by any means.

I'll agree to the second critique re: the credit in a full-reserve banking case.