Equation 138 · The Bend an Elevator Cannot Fake
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Symbol sigma_y
sigm is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
subscript
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What the article says around this equation
Take each edge’s fractional-frequency comparison uncertainty to be = 110^{-18} , the stability optical clocks have already demonstrated is what centimetre-level geodesy requires [ 8 ] . The combined noise on the independent-edge difference - is \, . Setting signal equal to noise, \, = \, , gives
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