Unconditional applicability of Lehmer's measure to the two-term Machin-like formula for $π$

@misc{abrarov2021unconditionalapplicabilitylehmers,
      title={Unconditional applicability of Lehmer's measure to the two-term Machin-like formula for $π$},
      author={Sanjar M. Abrarov and Rehan Siddiqui and Rajinder K. Jagpal and Brendan M. Quine},
      year={2021},
      eprint={2004.11711},
      archivePrefix={arXiv},
      primaryClass={math.GM},
      url={https://arxiv.org/abs/2004.11711},
}