If $(u_n)$ is a sequence of real numbers which is good for the ergodic theorem, is the sequence of the integer parts $([u_n])$ good for the ergodic theorem\,? The answer is negative for the mean ergodic theorem and affirmative for the pointwise ergodic theorem.
@article{118801, author = {Emmanuel Lesigne}, title = {On the sequence of integer parts of a good sequence for the ergodic theorem}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {36}, year = {1995}, pages = {737-743}, zbl = {0868.28010}, mrnumber = {1378695}, language = {en}, url = {http://dml.mathdoc.fr/item/118801} }
Lesigne, Emmanuel. On the sequence of integer parts of a good sequence for the ergodic theorem. Commentationes Mathematicae Universitatis Carolinae, Tome 36 (1995) pp. 737-743. http://gdmltest.u-ga.fr/item/118801/
Some results on non-linear recurrence, J. d'Analyse Math. 62 (1994), 29-46. (1994) | MR 1269198
Integer and fractional parts of good averaging sequences in ergodic theory, preprint, 1994. | MR 1412600 | Zbl 0865.28011
Almost sure convergence and bounded entropy, Israel J. Math. 63 (1988), 79-97. (1988) | MR 0959049 | Zbl 0677.60042
Topics in Almost Everywhere Convergence, Lectures in Advanced Mathematics 4, 1970. | MR 0261253 | Zbl 0198.38401