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Solutions to conjectures on a nonlinear recursive equation

Özkan Öcalan, Oktay Duman (2020)

Czechoslovak Mathematical Journal

We obtain solutions to some conjectures about the nonlinear difference equation x n + 1 = α + β x n - 1 e - x n , n = 0 , 1 , , α , β > 0 . More precisely, we get not only a condition under which the equilibrium point of the above equation is globally asymptotically stable but also a condition under which the above equation has a unique positive cycle of prime period two. We also prove some further results.

Solutions with big graph of iterative functional equations of the first order

Lech Bartłomiejczyk (1999)

Colloquium Mathematicae

We obtain a result on the existence of a solution with big graph of functional equations of the form g(x,𝜑(x),𝜑(f(x)))=0 and we show that it is applicable to some important equations, both linear and nonlinear, including those of Abel, Böttcher and Schröder. The graph of such a solution 𝜑 has some strange properties: it is dense and connected, has full outer measure and is topologically big.

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