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AI has access to a vastly larger working memory than the human brain
When an AI system solves a difficult mathematical problem, the usual explanation is that it has become more intelligent.
Perhaps it has absorbed millions of mathematical examples. Perhaps reinforcement learning has taught it better reasoning strategies. Perhaps it is beginning to develop something resembling genuine mathematical intuition.
All of these explanations may contain some truth. But they overlook a simpler possibility:
AI has access to a vastly larger working memory than the human brain.
Or, more precisely, it has access to an enormous external symbolic workspace that performs many of the functions that working memory performs in humans.
This difference may be especially important in mathematics.
A human mathematician can hold only a small number of unfamiliar elements in mind simultaneously. An AI model can keep the entire problem statement, hundreds of intermediate equations, several abandoned approaches, definitions, constraints and earlier conclusions inside its context window.
We normally interpret the resulting performance as evidence of superior reasoning. But some of it may instead reflect the removal of one of the most important biological limits on human reasoning: our extremely restricted working-memory capacity.
Working memory is the mental system that allows us to hold and manipulate information over short periods.
When solving an equation, you must remember what each variable represents, which operations have already been performed and what the current goal is. During a proof, you may need to keep track of assumptions, intermediate lemmas, exceptions and multiple possible cases.