@article{ontheconditionnumberupperboundofthelbfgs,
  title = {On the Condition Number Upper Bound of the L-BFGS Inverse Hessian Approximation Matrix with a Two-Sided Geometric Envelope Safeguarding Mechanism},
  author = {Don Li},
  year = {2026},
  eprint = {2607.05836},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.05836},
}