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Item Title:

The Algebra of Logic- Louis Couturat-Used


Books, Comics, Magazines



Item Condition: Used
Current Time:22 Jun 17 21:04:56
Time & Date displayed is forUnited States - EDT
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Quantity: (1 Available)
Price : £999.00 ($1276.32)

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Item Specifics - Books ISBN : 9781459004344
Author : Louis Couturat
999 16978962 The Algebra of Logic http://medium.snazal.com/?9781459004344 http://large.snazal.com/?9781459004344 Louis Couturat 9781459004344 9781459004344 Media Books 5.22 The Algebra of Logic Purchase of this bo
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Item Location: Leicester
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Title: The Algebra of Logic

Author(s): Louis Couturat
ISBN: 9781459004344
Sku Code: 9781459004344
Media > Books
The Algebra of Logic
Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ?. L: The part common to any class whatever and to null class is the null class; the sum of any class whatever and of the whole is the whole. The sum of the null class and of any class whatever is equal to the latter; the part common to the whole and any class whatever is equal to the latter. P. L: The simultaneous affirmation of any proposition whatever and of a false proposition is equivalent to the latter (i. e., it is false); while their alternative affirmation is equal to the former. The simultaneous affirmation of any proposition whatever and of a true proposition is equivalent to the former; while their alternative affirmation is equivalent to the latter (i. e., it is true). Remark.—If we accept the four preceding formulas as axioms, because of the proof afforded by the double interpretation, we may deduce from them the paradoxical formulas ? x, and x i, by means of the equivalences established above, (a = ab) = (a b) = (a + b = b). 14. The Law of Duality.—We have proved that a perfect symmetry exists between the formulas relating to multiplication and those relating to addition. We can pass from one class fo the other by interchanging the signs of addition and multiplication, on condition that we also interchange the terms ? and i and reverse the meaning of the sign [ (or transpose the two members of an inclusion). This symmetry, or duality as it is called, which exists in principles and definitions, must also exist in all the formulas deduced from them as long as no principle or definition is introduced which would overthrow them. Hence a true formula may be deduced from another true formula by transforming it by the principle of duality; that is, by following the rule given above. In its application the law of duality makes it possible to replace two de...

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