@article{auniversallyconsistentlearningrulewitha,
  title = {A universally consistent learning rule with a universally monotone error},
  author = {Vladimir Pestov},
  year = {2021},
  eprint = {2108.09733},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2108.09733v2},
}