the 2nd scientific american book of mathematical puzzles diversions

... 1920. The problem and the method of solving it can be easily extended to networks in the form of the other four Platonic solids. The three ways to number the faces of an octahedron so that the ... folding a strip of paper as explained in the first Scientific American Book of Mathe- matical Puzzles and Diversions. Close cousins to the hexa- flexagons are a wide variety of four-sided ... difficult to find a satisfactory proof. The 2nd SCIENTIFIC AMERICAN Book of ILLUSTRATED WITH DRAWINGS AND DIAGRAMS MARTIN GARDNER Mathematical Puzzles A NEW SELECTION : from...

Ngày tải lên: 31/05/2014, 01:31

... in the central portion of the mirror, where it is sup- ported by the edge of the tool. Hence the center of the mirror and edge of the tool grind fastest, the mirror becoming concave and the ... of the mirror. The size of the image will change as the mirror is moved toward or away from the screen. Find the dis- tance at which it is minimum. This is the approximate focal length of the ... responsible for the development of vitamin B^. The motivation of the scientist, professional or amateur, is the sheer joy of knowing. In fact, that is one of the principal satis- factions of being...

Ngày tải lên: 12/05/2014, 16:40

... now they were sitting on the throne of God, the only being higher than the president of the United States of America. They were members of the final American government. They would be responsible ... to them. Imagine all the pride in the history of America felt in one rush. They suddenly had proof of God, they were the most important men to have ever lived, they had jurisdiction over the ... the book you’re reading. So where’s the confusion? The book was about a writer in his fifties working on a book. In the future the book has yet to be written, even if it was written in the...

Ngày tải lên: 15/03/2014, 06:20

Ngày tải lên: 06/10/2014, 08:35

... depend on their time of maturity, the longevity of the breed, and the stamina of the individual. 11th. No violent cross, or mixing of distinct breeds, should ever be admitted for the purposes of perpetuation, ... value of the improved and ordinary breeds. A knowledge of the best mode of breeding and management is of still higher importance. The first will enable the breeder to preserve the high character of the ... necessary either for breeding or use. Throughout the Northeastern states, cows for the dairy, oxen for the yoke, and both for the butcher, are wanted. In much of the West and South, beef alone is the...

Ngày tải lên: 28/06/2014, 19:20

... one goblin skurried after, The Project Gutenberg EBook of Goblin Market, The Prince's Progress, and Other Poems, by Christina Rossetti This eBook is for the use of anyone anywhere at no cost ... Helen Grey 'By the Waters of Babylon' Seasons Mother Country A Smile and a Sigh Dead Hope Autumn Violets 'They Desire a Better Country' The Offering of the New Law Conference ... or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: Goblin Market, The Prince's Progress, and Other Poems Author:...

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 28/06/2014, 19:20

Ngày tải lên: 06/10/2014, 09:18

... to hold all these pictures, and each one of these books costs a thousand dollars. There were only seventy-five or eighty of these sets of bird books made, but you can see them in the Boston Public Library, ... to make pictures of these birds, listening to their songs, finding what kind of nests they built, and at what time of year they flew north or south. The Child's Book of American Biography, ... the worst thing he did was to join some other boys in the string joke. They used to tie strings from the seats of the bakery-wagons to the posts of high stoops and watch these strings knock off...

Ngày tải lên: 18/02/2014, 08:20

... College. I used the first edition of The Little Book of Semaphores along with one of the standard textbooks, and I taught Synchronization as a concurrent thread for the duration of the course. Each ... -4. When the 5th thread signals the barrier, one of the waiting threads is allowed to proceed, and the semaphore is incremented to -3. But then no one signals the semaphore again and none of the other ... al- lowed. At any time, the value of the semaphore represents the number of additional threads that may enter. If the value is zero, then the next thread will block until one of the threads inside...

Ngày tải lên: 15/03/2014, 11:20

... page is the home page of the Book of JavaScript website (http://www.bookofjavascript.com), which updates the time as well as the date (see Figure 2-2). You don’t have to sit in front of your ... store or hold the place of numbers. In JavaScript and other programming languages, variables also store other kinds of information. Syntax of Variables The syntax of variables (the set of rules ... knowledge of HTML, however. The Goals of This Book The main goal of this book is to get you to the point of writing your own JavaScripts. An important tool in learning to write scripts is the ability...

Ngày tải lên: 17/03/2014, 12:20

... BOOK OF PF THE BOOK OF PF A NO-NONSENSE GUIDE TO THE OPENBSD FIREWALL 2ND EDITION HANSTEEN 2ND EDITION THE BOOK OF PF THE BOOK OF PF www.it-ebooks.info PF Configuration Basics 19 A Stricter ... further detail about some of the statistics they provide in Chapter 9 when we use the data to optimize the configuration we are building. The following shows an example of just the top part of ... in the early 1990s, the code was liberated for further development by small groups of enthusiasts around the world. Some of these enthusiasts were responsible for keeping vital parts of the...

Ngày tải lên: 23/03/2014, 14:20

... represent the other major arithmetic functions. When the browser finishes its calculations in our example, it reaches the end of the JavaScript in the head (Z) and goes down to the body of the HTML. ... JavaScript, on the other hand, <! is the beginning of a comment that reaches only to the end of that one line, so browsers that understand JavaScript don’t ignore the rest of the JavaScript ... it was one hell of a challenge. And it was deeply satisfying when I got it to work correctly. When Dave asked me to do the technical review of the second edition of The Book of JavaScript, I...

Ngày tải lên: 28/04/2014, 16:58