 This attribution has been challenged, however, and another similarly named man, Christopher Wursteisen, has been credited with introducing Copernicus's theories to Padua.His mathematical book "Elementa arithmeticae" was read by John Milton and the Hungarian philosopher Andreas Dudith.In his chronicle of Basel from 1580, Wurstisen named the heraldic tinctures after the initials of the given colours, a principle called tricking.