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The limit q-Bernstein operator emerges naturally as a modification of the Szász-Mirakyan operator related to the Euler probability distribution. At the same time, this operator serves as the limit for a sequence of the q-Bernstein polynomials with . Over the past years, the limit q-Bernstein operator has been studied widely from different perspectives. Its approximation, spectral, and functional-analytic properties, probabilistic interpretation, the behavior of iterates, and the impact on the analytic characteristics of functions have been examined. It has been proved that under a certain regularity condition, improves the smoothness of a function which does not satisfy the Hölder condition. The purpose of this paper is to exhibit ‘exceptional’ functions whose smoothness is not improved under the limit q-Bernstein operator. MSC: 26A15, 26A16, 41A36.

Functions whose smoothness is not improved under the limit q-Bernstein operator