Figure 2: Chara teristi ones and bases.Lemma 6.1. Let τ > 0. If y ∈ Sτ , then for all θ ∈ [0, τ ] there exists a positive onstant cj su h that L1(Iθy,τ ) = χ+(θ; y, τ)− χ−(θ; y, τ) ≤ −cjντ ({y}). (55)Lemma 6.2. Let τ0 > 0. Then for µτ0-a.e. x there exists η := η(x, τ0, τ) > 0 su h that
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