∑Notes

Door

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#1
(i) Each has , so:
$τ \cdot ∣ Σ_{τ} ∣ \leq i \in Σ_{τ} \sum b_{F, t} (i) \leq i \in F \sum b_{F, t} (i) = cut_{t} (F, \overset{ˉ}{F}) \leq θ \cdot vol_{t} (F) .$