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Fri Jan 27, 2012, 12:41 PM

The square root of two (numberphile video)



Approximately 1.414213562373095048801688724...

The square root of two is a fascinating number with a long and sordid history. It also forms the basis of most office paper, such as A4, A3, etc.

This video features Professor Roger Bowley and Dr James Grime.

8 replies, 2018 views

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Arrow 8 replies Author Time Post
Reply The square root of two (numberphile video) (Original post)
pokerfan Jan 2012 OP
grantcart Jan 2012 #1
pokerfan Jan 2012 #3
baldguy Jan 2012 #2
dipsydoodle Jan 2012 #4
pokerfan Jan 2012 #5
rerevisionist Oct 2012 #7
pokerfan Oct 2012 #8
dipsydoodle Jan 2012 #6

Response to pokerfan (Original post)

Fri Jan 27, 2012, 01:00 PM

1. Is this going to be on the test?

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Response to grantcart (Reply #1)

Fri Jan 27, 2012, 01:16 PM

3. President Ford agrees

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Response to pokerfan (Original post)

Fri Jan 27, 2012, 01:02 PM

2. at 6:36: from Prof Bowley:

"If you come up with an idea which is right, but goes againt conventional wisdom, you can be sent to a desert island, or burnt at the stake, or executed, because people don't like their ideas about how the world should be upset. even if you can disprove that it's not a good idea to urinate towards the Sun."

I bet that Teabaggers wouldn't like this guy.

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Response to pokerfan (Original post)

Fri Jan 27, 2012, 01:22 PM

4. Nice presentation

I figured out the stuff on A paper sizes nearly twenty years ago when I selling photocopiers but don't recall why I bothered to do so.

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Response to dipsydoodle (Reply #4)

Fri Jan 27, 2012, 01:53 PM

5. paper

U.S. paper sizes are currently standard in the United States, the Philippines and Chile.



Imperial units of measurement are currently standard in the United States, Burma and Liberia.



No offense to the Philippines, Chile, Burma and Liberia, but c'mon!

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Response to pokerfan (Reply #5)

Mon Oct 29, 2012, 02:27 PM

7. Halvable

Halvable paper sizes have sides in ratio 1.414 to 1.

This means when halved the paper is .707 to 1, or, turned round, 1 to .707, which is the same as 1.414 to 1.

So A0 when halved is A1, then A2 etc - useful for photocopying and printing.

You may have missed this point, which, after all, was not specifically mentioned.

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Response to rerevisionist (Reply #7)

Mon Oct 29, 2012, 03:20 PM

8. It was covered in the video, was it not? (nt)

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Response to pokerfan (Original post)

Fri Jan 27, 2012, 02:12 PM

6. More on the subject in general here......

http://en.wikipedia.org/wiki/ISO_216

... for anyone sufficiently interested.

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