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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 
Newbie Joined: May 2015 From: Bangladesh Posts: 5 Thanks: 0  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 
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  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. Almost certainly. 
May 5th, 2015, 11:01 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,099 Thanks: 1905  
May 5th, 2015, 01:56 PM  #6  
Newbie Joined: May 2015 From: Bangladesh Posts: 5 Thanks: 0  Quote:
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  

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