Equation 26 · Part 3 · Why Average Success Rate Hides the Failures That Matter Most
Symbol q_τ
What this part means
q_τ occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.
Its job in the formula
q_τ occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.
Full expression→Symbol q_τ→Article meaning
The passage around this formula
…is about the spread of a difference, not the rarity of an event. Bounding or estimating a rare catastrophic-failure rate is different in kind: the required sample size is inversely proportional to the rate itself. At = 10^{-3} , getting even a rough twenty-event estimate needs on the order of twenty thousand trials. At = 10^{-5} — the dangerous-failure probability ceiling regulated safety-critical software is held to under the SIL 4 standard, a bar Rabanser and colleagues cite alongside the FAA’s…
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the surrounding passage
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