abs representation?

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Do these brackets represent absolute value highlighted yellow below? These are equations for fault detection on sensor data for analysis in HVAC system operation.

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Unless something really weird is going on, then yes that is an absolute value. Interestingly, there seems to be a typo on the other side of the inequality. I imagine they meant: $\sqrt{\varepsilon\mathrm{MAT}^2+\varepsilon\mathrm{OAT}^2}$.