《Numbers: Their Occult Power and Mystic Virtue》數字的神秘象徵 (Occult Power of Numbers)William Wynn Westcott (1890)
Of this we see an image in the duad of Arithmetic, for as Proclus observes : "The duad is the medium between unity and number, for unity by addition produces more than by multiplication, but number by addition produces less than by multiplication ; whilst the Duad whether added to itself, or multiplied by itself produces the same.
段落 westcott-22public-domain (1890)
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