A decade is a factor of ten so an octave must be a factor of eight mustn't
it?   Well, no it is actually a factor of two.   Why?   Very illogical.
I know it is borrowed from musical theory where an octave is an interval of
seven notes.  Equally illogical

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David C Brown
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Whaley Bridge
High Peak                           Phone: 01663 733236
Derbyshire                eMail: dcb.home@gmail.com
SK23 7ND          web: www.bings-knowle.co.uk/dcb
<http://www.jb.man.ac.uk/~dcb>
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