Heavenly Numbers


Book Description

This book is a history of the development of mathematical astronomy in China, from the late third century BCE, to the early 3rd century CE - a period often referred to as 'early imperial China'. It narrates the changes in ways of understanding the movements of the heavens and the heavenly bodies that took place during those four and a half centuries, and tells the stories of the institutions and individuals involved in those changes. It gives clear explanations of technical practice in observation, instrumentation, and calculation, and the steady accumulation of data over many years - but it centres on the activity of the individual human beings who observed the heavens, recorded what they saw, and made calculations to analyse and eventually make predictions about the motions of the celestial bodies. It is these individuals, their observations, their calculations, and the words they left to us that provide the narrative thread that runs through this work. Throughout the book, the author gives clear translations of original material that allow the reader direct access to what the people in this book said about themselves and what they tried to do.




Surreal Numbers


Book Description

Nearly 30 years ago, John Horton Conway introduced a new way to construct numbers. Donald E. Knuth, in appreciation of this revolutionary system, took a week off from work on The Art of Computer Programming to write an introduction to Conway's method. Never content with the ordinary, Knuth wrote this introduction as a work of fiction--a novelette. If not a steamy romance, the book nonetheless shows how a young couple turned on to pure mathematics and found total happiness. The book's primary aim, Knuth explains in a postscript, is not so much to teach Conway's theory as "to teach how one might go about developing such a theory." He continues: "Therefore, as the two characters in this book gradually explore and build up Conway's number system, I have recorded their false starts and frustrations as well as their good ideas. I wanted to give a reasonably faithful portrayal of the important principles, techniques, joys, passions, and philosophy of mathematics, so I wrote the story as I was actually doing the research myself."... It is an astonishing feat of legerdemain. An empty hat rests on a table made of a few axioms of standard set theory. Conway waves two simple rules in the air, then reaches into almost nothing and pulls out an infinitely rich tapestry of numbers that form a real and closed field. Every real number is surrounded by a host of new numbers that lie closer to it than any other "real" value does. The system is truly "surreal." quoted from Martin Gardner, Mathematical Magic Show, pp. 16--19 Surreal Numbers, now in its 13th printing, will appeal to anyone who might enjoy an engaging dialogue on abstract mathematical ideas, and who might wish to experience how new mathematics is created. 0201038129B04062001




My Very First Book of Shapes


Book Description

Can you find what is round? What is square? In this timeless new split-pageboard book, children can find the bottom half of a page that matches the top half. Find the right pairs, and you will learn to identify all kinds of shapes. From dome-shaped ladybugs to diamond- shaped kites, this clever board book makes learning fun.













Technical Bulletin


Book Description










A Letter from Your Teacher


Book Description

From the author and illustrator of Our Class is a Family, this touching picture book expresses a teacher's sentiments and well wishes on the last day of school. Serving as a follow up to the letter in A Letter From Your Teacher: On the First Day of School, it's a read aloud for teachers to bid a special farewell to their students at the end of the school year. Through a letter written from the teacher's point of view, the class is invited to reflect back on memories made, connections formed, and challenges met. The letter expresses how proud their teacher is of them, and how much they will be missed. Students will also leave on that last day knowing that their teacher is cheering them on for all of the exciting things to come in the future. There is a blank space on the last page for teachers to sign their own name, so that students know that the letter in the book is coming straight from them. With its sincere message and inclusive illustrations, A Letter From Your Teacher: On the Last Day of School is a valuable addition to any elementary school teacher's classroom library.




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