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Sunday, June 17, 2012
How To Get Google Chrome OS
This video shows you two different ways for installing Chrome OS by Google without harming your current computer settings. The links below are used in the video:
Win32 Image Writer - https://launchpad.net/win32-image-writer/+download
ChromiumOS Cherry -http://www.tinkernut.com/demos/215_chrome/ChromeOS-Cherry.tar.gz
VirtualBox - http://www.virtualbox.org
Explaining USB 3.0
This video explains the new 'superspeed' USB 3.0 standard for connecting things to computers. It is produced and presented by Christopher Barnatt of ExplainingComputers.com, and Associate Professor of Computing & Future Studies in Nottingham University Business School.
Explaining Web 2.0
This video explains interpersonal computing, web services and software as a service (SaaS) as the the three key aspects of Web 2.0. It is produced and presented by Christopher Barnatt, author of ExplainingComputers.com, and Associate Professor of Computing & Future Studies in Nottingham University Business School.
Har Har MahaDev
Successive Differences of Powers
List the squares:
0, 1, 4, 9, 16, 25, 36, 49, ...
Then take their successive differences:
1, 3, 5, 7, 9, 11, 13, ...
Then take their successive differences again:
2, 2, 2, 2, 2, 2, ...
So the 2nd successive differences are constant(!) and equal to 2.
OK, now list the cubes, and in a similar way, keep taking successive differences:
0, 1, 8, 27, 64, 125, 216, 343, 512, ...
1, 7, 19, 37, 61, 91, 127, 169, ...
6, 12, 18, 24, 30, 36, 42, ...
6, 6, 6, 6, 6, 6, ...
Gee, the 3rd successive differences are all constant(!) and equal to 6.
What happens when you take the 4th successive differences of 4th powers? Are they constant? What do they equal? (They're all 24.) And the 5th successive differences of 5th powers?
Aren't derivatives similar to differences? What do you think happens when you take the n-th derivative of xn?
Presentation Suggestions:
Have students do these investigations along with you. If you assign the n-th derivative of xn on a previous homework, then you can make the connection between the two right away.
The Math Behind the Fact:
This pattern may seem very surprising. It can be proved by induction. Taking differences is like a discrete version of taking the derivative, where the space between successive points is 1.
This idea has a very practical application: given a sequence generated by an unknown polynomial function, you use the calculation of successive differences to determine the order of the polynomial! Then use the first N terms of the sequence with the first N terms of the polynomial to solve for the generating function.
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