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Monty
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Jun2209, 01:05 PM (EST) 

"Phthagoras' proof #10"

I guess I forgot to mention that the proof 10 of Pythagoras I sent you appeared in "Arithmetic in Nine Sections" which was 'published' in China in the third century BC. At least that's what I found when I was writing the issue of Gnarly Gnews dated 210 BC Xian, China 

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Monty
guest

Jun2509, 03:40 PM (EST) 

2. "RE: Phthagoras' proof #10"
In response to message #1

The only Bhaskara I find is 12th century AD. I can't find any mathematicians in 12th century BC. Here are two sources that back my claim about the Chinese proof. One is The History of Mathematics, by DE Smith, Volume I, page 30. It contains the figure I sent to you. Smith says "The illustration is from a very early specimen of block printing. It'shows the figure of the Pythagorean Theorem but gives no proof." The other is Wikipedia, at https://en.wikipedia.org/wiki/The_Nine_Chapters_on_the_Mathematical_Art which specifically mentions a proof, though it gives no figure. 

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