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the number of terms being much less than the number of frequencies. This law is quite unintelligible from the classical standpoint. Read the first page
Front Cover | Copyright | Table of Contents | Excerpt | Index | Back Cover
the number of terms being much less than the number of frequencies. This law is quite unintelligible from the classical standpoint. Read the first page
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Front Cover | Copyright | Table of Contents | Excerpt | Index | Back Cover
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Most Helpful Customer Reviews
4 of 4 people found the following review helpful
Format:Paperback
This book is not intended to learn quantum mechanics up from scratch.
Nonetheless, the great Dirac made a great job of compiling very slippery concepts in a fes pages. And with a very well built, concise and clear thread of thinking.
If you have passed an undergraduate course in quantum mechanics and want to know how the founders made up all the framework out of empirical results compiled by experimental physicists from the second half oh 18th century on, this is a great book. Perhaps some pages may seem a bit "out of fashion" nowadays (as issues long ago well studied and establishes are brought up) but to see how Dirac goes through the mathematical formalism (with the notation he very much help develop)and bring together Schrodinger and Heisenberg pictures and link it all with Hamiltonian classical Mechanics (first half of the book) is worth the money spent.
This has been a classic for more than seventy years, I can see why
Note I'm a Msc in Physics but I do not pursue a career in research, I bought this book out of curiosity to see how the Nobel cofounder of Quantum Physics explain the concepts involved...
Nonetheless, the great Dirac made a great job of compiling very slippery concepts in a fes pages. And with a very well built, concise and clear thread of thinking.
If you have passed an undergraduate course in quantum mechanics and want to know how the founders made up all the framework out of empirical results compiled by experimental physicists from the second half oh 18th century on, this is a great book. Perhaps some pages may seem a bit "out of fashion" nowadays (as issues long ago well studied and establishes are brought up) but to see how Dirac goes through the mathematical formalism (with the notation he very much help develop)and bring together Schrodinger and Heisenberg pictures and link it all with Hamiltonian classical Mechanics (first half of the book) is worth the money spent.
This has been a classic for more than seventy years, I can see why
Note I'm a Msc in Physics but I do not pursue a career in research, I bought this book out of curiosity to see how the Nobel cofounder of Quantum Physics explain the concepts involved...
27 of 30 people found the following review helpful
Format:Paperback
"God said 'Let Dirac be' and all was light", the poet would have said again, if only he were still alive. Dirac's wonderful book is not only the source of the present language used by physicists, but it is still the best grammar and epical poem. Physics doesn't get any better than this. Schwinger learn't here his quantum mechanics when he was fourteen, and Feynman took here his inspiration for his path integral formulation of the theory. But also for us, mortals, this is the limpid, adult, final exposition of it all. The first chapter alone would be worth the price. Very profound comments enrich practically every single page. Covers also relativistic quantum mechanics (which he invented!). The last chapter, on quantum electrodynamics, is dated. Read it attentively, though. You never know! For the "newbie", Dirac is in the very select group of physicists which includes Einstein, Maxwell, Newton and, perhaps, a couple more...
48 of 69 people found the following review helpful
Format:Paperback
..Every physicist learns to respect and look up to the legendary figure of Dirac. Also, sooner or later, every physicist hears about Dirac's "elegant" book on QM. Some courses list it as a reference.
However, there are several reasons to avoid this book as a source of knowledge and/or learning. These are:
1.) It is outdated. The introductory chapters on QED (the last ones in the book) have long since been outdated. No one thinks of field theory that way anymore.
2.) It is mathematically sloppy. Dirac introduces the Bra and Ket notation (for which he is responsible, by the way) without mentioning the dual space, and sometimes even reasons wrongly; i.e., he writes "let us postulate that for each ket, there exists a corresponding bra" - this is not a postulate. This is ALWAYS true for finite dimensional vector spaces, and NEVER true for infinite dimensional vector spaces, and can be proven mathematically. In short, there is little attention given to the mathematics behind QM.
3.) Dirac wasn't a pedagog. There aren't any solved examples, and his treatment of many topics is much, much too brief - about 2 pages for the Hydrogen atom? A page for angular momentum? Three for the harmonic oscillator? Come on, to understand these things one needs to see them from many different perspectives, and Dirac's way of doing things is taking the shortest route between two points (which is why he is often described as "elegant") - this doesn't afford the reader the opportunity to get to know these topics in depth.
However, there are several reasons to avoid this book as a source of knowledge and/or learning. These are:
1.) It is outdated. The introductory chapters on QED (the last ones in the book) have long since been outdated. No one thinks of field theory that way anymore.
2.) It is mathematically sloppy. Dirac introduces the Bra and Ket notation (for which he is responsible, by the way) without mentioning the dual space, and sometimes even reasons wrongly; i.e., he writes "let us postulate that for each ket, there exists a corresponding bra" - this is not a postulate. This is ALWAYS true for finite dimensional vector spaces, and NEVER true for infinite dimensional vector spaces, and can be proven mathematically. In short, there is little attention given to the mathematics behind QM.
3.) Dirac wasn't a pedagog. There aren't any solved examples, and his treatment of many topics is much, much too brief - about 2 pages for the Hydrogen atom? A page for angular momentum? Three for the harmonic oscillator? Come on, to understand these things one needs to see them from many different perspectives, and Dirac's way of doing things is taking the shortest route between two points (which is why he is often described as "elegant") - this doesn't afford the reader the opportunity to get to know these topics in depth.
This book can only be of interest to people who are interested in the history of QM or would like to hear a great physicist's way of viewing it - which isn't always different from the usual interpretations you get exposed to in more contemporary literature.
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