A study of Babylonian planetary theory III. The planet Mercury Teije de Jong OriginalPaper Open access 03 January 2021 Pages: 491 - 522
Einstein on involutions in projective geometry Tilman SauerTobias Schütz OriginalPaper Open access 08 January 2021 Pages: 523 - 555
The six books of Diophantus’ Arithmetic increased and reduced to specious: the lost manuscript of Jacques Ozanam (1640–1718) Francisco Gómez-GarcíaPedro J. Herrero-PiñeyroAntonio Mellado-Romero OriginalPaper 13 April 2021 Pages: 557 - 611