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The "golden rule of three" - what's that?
From: Tony Oz
Date: 2018 Feb 11, 14:52 -0800
From: Tony Oz
Date: 2018 Feb 11, 14:52 -0800
Hello.
I'm reading the "History of Nautical Astronomy", Mr Cotter describes the state of (apparently insufficient) mathematical literacy of seamen of 15th century like that:
...importance in introducing to the English seamen ... the elements of mathematics beyond the golden rule of three.
What is that?
Recently I had some hard time guessing what the "butterfly multiplication method" is. We, in Russia, were never tought anything like that.
Please comment.
Regards,
Tony
