Archimedes, [15], [16]

Arcus Pictagore, [122]

Arjuna, [15]

Arnold, E., [15], [102]

Ars memorandi, [141]

Āryabhaṭa, [39], [43], [44]

Aryan numerals, [19]

Aschbach, [134]

Ashmole, [134]

Aśoka, [19], [20], [22], [81]