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The original (non-specific) Rice formula: The proof◮ Take a (positive) approximate delta function, δ ε , supported on[−ε, +ε], and ∫ R δ ε(x) dx = 1.∫1 =Rδ ε (x − u) dx =∫ t u1t l 1|ḟ (t)| δ ε (f (t) − u) 1 (0,∞) (f (t)) dt∫ t u1= lim |ḟ (t)| δε→0ε(f (t) − u) 1 (0,∞) (f (t)) dtt1lU u (f , T ) = lim |ḟ ε→0∫T(t)| δ ε(f (t) − u) 1 (0,∞) (f (t)) dt

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