It is struggling to attract customers, and has lead many investors to complete sum-of-the-parts valuations: Many believe Sears will either liquidate or that Lampert will buy the small public float that remains.

FORBES: Sears Still Drenched In Red Ink: Q3 Loss Wider Than Expected

Mr Gamm appeared to be using his long-term memory to store the working results that he needed to complete his calculations for example, all the dividends and remainders of a division sum.

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