Tuesday, 6 October 2015
Ebook Size : 56.4 MB
Download : Biology - A complete text book on Biology
Alternate Link: Download for free at openstax COLLEGE
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Sunday, 27 September 2015
Ebook Size : 2MB
Download : Handbook of Spoken Mathematics
This handbook answers some of the needs of the many people who have to deal with spoken mathematics, yet have insufficient background to know the correct verbal expression for the written symbolic one. Mathematical material is primarily presented visually, and when this material is presented orally, it can be ambiguous. While the parsing of a written expression is clear and well-defined, when it is spoken this clarity may disappear. For example, “One plus two over three plus OW" can represent the following four numbers, depending on the parsing of the expression: 3/7, 1 2/7, 5 , 5 2 j 3 . However, when the corresponding written expression is seen, there is little doubt which of the four numbers it represents. When reading mathematics orally, such problems are frequently encountered. Of course, the written expression may always be read symbol by symbol, but if the expression is long or there are a cluster of expressions, it can be very tedious and hard to understand. Thus, whenever possible, one wishes to have the written expression spoken in a way that is interest retaining and easy to understand.
In an attempt to alleviate problems such as these, this handbook has been compiled to establish some consistent and well-defined ways of uttering mathematical expressions so that listeners will receive clear, unambiguous, and well-pronounced representations of the subject.