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Topic: [HM] Bombelli: Cube root of Complex Nos.
Replies: 8   Last Post: Feb 19, 2001 5:31 AM

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Heinz Lueneburg

Posts: 226
Registered: 12/3/04
Re: [HM] Bombelli: Cube root of Complex Nos.
Posted: Feb 19, 2001 5:31 AM
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Dear friends,

One more comment on the term "numero sano". This term was used extensively
by Luca Pacioli in his "Summa". Before Pacioli, it was already used by
Piero della Francesca in his "Trattato d'abaco". I also find it in the second
edition of Pietro Cataneo's "Le pratiche delle due prime matematiche" of 1567.
I haven't seen the first edition.

Counting also Fibonacci's Latin "numerus sanus", the word "sano" was used for
at least 350 years to denote an integral (untouched, virginal) number.

Besides the words "sanus", "sano", the words "integer", "intero", "intiero"
were also used during that time.

Best regards, Heinz Lueneburg

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