Equation 47 · A Horizon Is a Toll Booth, Not a Loophole
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Symbol Δτ
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change
Capital delta attached to a quantity marks a difference between two values of that quantity; the article’s sign convention determines the order.
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What the article says around this equation
That second identity is the entire resolution in miniature, and it is worth deriving [] both ways to see it operate. Hold the local energy budget fixed at =' (a battery physically at the processor, delivering a fixed amount of locally measured energy) over a proper interval :
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