5. CONCLUSION. We have proved that the radicals given by equation (1) have limits
two times the fixed points of the Chebycheff polynomials T2n .x/, thus unveiling an
interesting relation between these topics.
In [11], the authors defined the set S2 of all continued radicals of the form (1) (with
a0 D 1) and they investigated some of its properties by assuming that the limit of the
radicals exists. With this note, we have partially bridged this gap. It is straightforward
to see that the limit exists, but we have identified it only for periodic radicals.
The continued radical