First-Order Frege Theory is Undecidable

Warren D. Goldfarb. First-Order Frege Theory is Undecidable. J. Philosophical Logic, 30(6):613-616, 2001. [doi]

@article{Goldfarb01,
  title = {First-Order Frege Theory is Undecidable},
  author = {Warren D. Goldfarb},
  year = {2001},
  doi = {10.1023/A:1013362627445},
  url = {http://dx.doi.org/10.1023/A:1013362627445},
  researchr = {https://researchr.org/publication/Goldfarb01},
  cites = {0},
  citedby = {0},
  journal = {J. Philosophical Logic},
  volume = {30},
  number = {6},
  pages = {613-616},
}