His primary achievement was the production of a new edition of Euclid's Elements, in which he corrected scribal errors that had been made over the course of nearly 700 years of copying.
Pencapaian utamanya adalah dalam memproduksi edisi baru Elemen karya Euklides, dan ia telah memperbaiki kesalahan penulisan yang telah dilakukan dalam proses penyalinan selama hampir 700 tahun.