Showing posts with label physics. Show all posts
Showing posts with label physics. Show all posts

Cybernetics, Second Edition: or the Control and Communication in the Animal and the Machine Review

Cybernetics, Second Edition: or the Control and Communication in the Animal and the Machine
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Cybernetics, Second Edition: or the Control and Communication in the Animal and the Machine ReviewTwo books, both written in the late 1940s stand out as contributing much to our understanding of the world around us. One of these is "Cybernetics" by Weiner and the other is "The mathematical theory of communication" by Shannon. Both require some study by contain many sections that are easily readable by anyone which get the main points across in an understandable manner.
Weiner's book discuses the use of feedback on virtually every type of control mechanism known... i.e., those of nature as well as those of man. It is the "basic" stuff that everyone of us uses everyday and every moment of our lives whether we are aware of it or not. Whereas Shannon's book tells us how to communicate information in an error-free (or nearly so) way, Weiner's book explains how that information is used to provide effective control of everything around us. For many decades since I first was introduced to these two works, I have used their principles in most things I do.
I very highly recommend these two books to anyone who considers themselves a "thinking person" and is seeking to understand the world around them. Both easily get 5 stars. They are major works!Cybernetics, Second Edition: or the Control and Communication in the Animal and the Machine Overview

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Modern Differential Geometry for Physicists (2nd Edition) (World Scientific Lecture Notes in Physics) Review

Modern Differential Geometry for Physicists (2nd Edition) (World Scientific Lecture Notes in Physics)
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Modern Differential Geometry for Physicists (2nd Edition) (World Scientific Lecture Notes in Physics) ReviewWow! What a great Table of Contents. It has all the stuff I've been wanting to learn about. So I bought the book in spite of seeing only one review of it. After one day, I'm now only at page 26, but I already have read enough to make some comments about it.
The main point about this book is that it is, as the author specifically states, LECTURE NOTES, not, I repeat, not a textbook. What are the implications of this (outside of a somewhat more chatty style than a textbook)? ["chatty" isn't quite what I mean; "smooth" might be a better word'] There are two which are noticable to me. 1) A lot of math knowledge is taken for granted. 2) It has a somewhat sloppy style to it.
Regarding point one, make sure you have a lot of math under your belt before picking up this book. By page 18 the author uses these terms without defining them: Differentiable Manifold, semigroup, Riemannian Metric, Topological Space, Hilbert Space, the "" notation, vector space, and Boolean Algebra. Fortunately for me, I have a fairly extensive math education, and self-studied Functional Analysis, so I wasn't thrown for a loop; but for many others -- brace yourselves!
Regarding point two, Here are two examples:
1) Here is a quote: "The collection of all open sets in any metric space is called the topology associated with the space." Sounds like a definition to me! Fortunately the author gives a (sloppy) definition a few lines later. By the way, the only thing the reader learns about what an 'open set' is, is that it contains none of its boundary points. All the topology books I have read define open sets to be those in the topology. This is another point of confusion for the reader. In fact, points of confusion abound in that portion of the book.
2) On page, 17, trying somewhat haphazardly to explain the concept of a neighborhood, the author defines N as "N := {N(x) | x is an element of X}" This is already a little disconcerting: x is already understood to be an element of X. So he is saying that N is defined as N(x) (which he defines to be a collection of subsets of X). This is all he has to say on the matter until, on page 26, he writes "each N, an element of N(x)". Now N isn't both N(x) and an element of N(x). This is a point which the author does not clear up. He then starts using N all over the place, yet the reader isn't sure of what he's refering to.
A couple of other things:
-When he defines terms, they is not highlighted, and are embedded in a sentence, making it difficult to find them later.
- The index is pitifully small. Typical for English texts, I know; but this *is* the 3rd millinium!
On the other hand, I have good things to say about the book, too.
I like his style of writing. If it were just more precise, it would be fine for me. I like it better than the normal higher math texts, which tend to be too laconic for me. Notice that I make a distinction between the somewhat chatty style, which I like, and the sloppiness, which is confusing. One can be chatty, yet clear. So far, the undefined math terms which I listed above were not central to the text; and one would not miss much by just reading past them. The author includes many 'comments' sections throughout the book. These are wonderful so far. They are full of comments and examples which really clear up a lot of points. His examples are very good, too, although he is very terse in stating them. The paperback is nice looking. The paper, font, etc. make for easy reading (except for the sub/super-script font, which is too small for me).
To wrap this review up, I had already pretty much learned the stuff covered in the book so far, but judging from what I have read, I will be able to learn a lot from the rest of it; and, unlike some other math books I have studied, the experience won't be too painful.
p.s. See other reviews of it on the UK Amazon site.Modern Differential Geometry for Physicists (2nd Edition) (World Scientific Lecture Notes in Physics) Overview

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The Cambridge Handbook of Physics Formulas Review

The Cambridge Handbook of Physics Formulas
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The Cambridge Handbook of Physics Formulas ReviewIt contains:
- units, All constants, conversion between units, dimensions
- Math: Differential Equations, Vector algebra, Integration tables, Series, Limits, Trig, Complex variables and analysis, polynomials (all kinds), some probability and statistics, basic geometry (perimeter, area and volume)
- Dynamics and mechanics (including fluids)
- Quantum physics
- Thermodynamics
- Solid state physics (With periodic table)
- Electromagnetism
- Optics
- Astrophysics
These are just formulas, there are no concepts descriptions or solved problems, yet is the most handy reference of college level math and physics for science, CS, math, phys majorsThe Cambridge Handbook of Physics Formulas Overview

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The Physics of Soccer: Using Math and Science to Improve Your Game Review

The Physics of Soccer: Using Math and Science to Improve Your Game
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The Physics of Soccer: Using Math and Science to Improve Your Game ReviewI ordered this book with the hope of some practical and insightful thoughts as to the real dynamics of the game broken down--about how specific moments in the game could be measured and viewed. The introduction purports to make the book accessible to young players and it is hardly that. Unfortunately this book is a waste of paper more than a waste of time. As I read through the first 100 pages I found myself reading with a red pen halfway through. While the concept is great, the serious soccer player or fan of the game will be bored mindless as to repetition of paragraphs that deal with science or STEM as the author indicates. The author tries to communicate the whole scientific realm with the readability of a science class. If this is for the lay person, it truly missed the mark. There are several graphs and interesting concepts as to angles and force distribution but it needs to be focused for practical use. The book takes the shape of a soccer manual and science text for the traditional soccer mom and not the actual player. Coaches would be best to save their money. Same with players.The Physics of Soccer: Using Math and Science to Improve Your Game Overview

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