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Build a network to begin.
Network dismantling: NP-hard to find optimal removal sequence.
Scale-free networks are robust to random failure (hubs rare) but fragile to targeted attack — removing top-degree hubs rapidly fragments the network.
Percolation threshold: p_c for BA networks is ≈0 under targeted attack; for random: p_c → 1 − 1/(⟨k²⟩/⟨k⟩ − 1).