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Recurrence Relationsmedium
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A recurrence an=c1an−1+c2an−2a_n = c_1 a_{n-1} + c_2 a_{n-2}an​=c1​an−1​+c2​an−2​ is stable if all roots rrr of the characteristic equation satisfy ∣r∣<1|r| < 1∣r∣<1. Which of these is stable?