Thus, where the ''image'' <math>J\!</math> is the logarithm map, the ''compound'' <math>K\!</math> is the numerical sum, and the the ''ligature'' <math>L\!</math> is the numerical product, one obtains the immemorial mnemonic motto: | Thus, where the ''image'' <math>J\!</math> is the logarithm map, the ''compound'' <math>K\!</math> is the numerical sum, and the the ''ligature'' <math>L\!</math> is the numerical product, one obtains the immemorial mnemonic motto: |