My Math Forum Is this Njwildberger guy (in YouTube) any good?

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 May 5th, 2015, 07:52 AM #1 Newbie   Joined: May 2015 From: Bangladesh Posts: 5 Thanks: 0 Is this Njwildberger guy (in YouTube) any good? I just wanted to learn some hyperbolic geometry by myself. And I found this YouTube channel which has many lectures on many different math topics: https://www.youtube.com/user/njwildberger Has anyone tried his lectures before? Is he any good?
 May 5th, 2015, 08:10 AM #2 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms He's knowledgeable and the math he teaches is correct. His preferred approach, rational trigonometry, is not used by any other people as far as I know, so it may make it a bit harder for you to learn from other texts or people in the future.
May 5th, 2015, 08:48 AM   #3
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 Originally Posted by CRGreathouse He's knowledgeable and the math he teaches is correct. His preferred approach, rational trigonometry, is not used by any other people as far as I know, so it may make it a bit harder for you to learn from other texts or people in the future.
I don't know what rational trigonometry is. Does he use it in his lectures on hyperbolic geometry?

May 5th, 2015, 09:33 AM   #4
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 Originally Posted by pnerd I don't know what rational trigonometry is.
In summary, using squared distances ("quadrances") instead of distances, squared sine ("spread") in place of sine or other trig functions, and using only rational numbers and constructive methods.

Quote:
 Originally Posted by pnerd Does he use it in his lectures on hyperbolic geometry?
Almost certainly.

May 5th, 2015, 11:01 AM   #5
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 Originally Posted by pnerd I just wanted to learn some hyperbolic geometry by myself.
Where are starting from as far as geometry and algebra are concerned?

May 5th, 2015, 01:56 PM   #6
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 Originally Posted by skipjack Where are starting from as far as geometry and algebra are concerned?
Well, I did algebra and Euclidean geometry in high school. Then analytic geometry in high school and college. Also one introductory course on abstract algebra in college (about 10 years ago).

Can anyone suggest any other sources for learning hyperbolic geometry?

 May 5th, 2015, 02:10 PM #7 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms Thanks from pnerd

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