I came across this symbol on page xix of the book Universal Artificial Intelligence by Hutter:
It is used for the Solomonoff-Levin universal semi-measure. I've never seen it before, and wondering if anyone can help me understand. Thanks.
2026-05-16 17:25:46.1778952346
What does $\overset \times =$ mean?
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It is specified on that very same page:
Thus, $a\overset{\times}{=}b$ means "equal, within a multiplicative constant".
More information is on p.33: