By I.M. Yaglom, I.G. Volosova

The current booklet is predicated at the lecture given by means of the writer to senior students in Moscow at the twentieth of April of 1966. the excellence among the cloth of the lecture and that of the ebook is that the latter contains workouts on the finish of every part (the such a lot tricky difficulties within the workouts are marked through an asterisk). on the finish of the ebook are positioned solutions and tricks to a couple of the issues. The reader is suggested to unravel many of the difficulties, if no longer all, simply because merely after the issues were solved can the reader make sure that he is aware the subject material of the e-book. The publication comprises a few non-compulsory fabric (in specific, Sec. 7 and Appendix that are starred within the desk of contents) that may be passed over within the first examining of the e-book. The corresponding elements of the textual content of the publication are marked by way of one celebrity before everything and through stars on the finish. besides the fact that, within the moment interpreting of the e-book it's essential to examine Sec. 7 because it comprises a few fabric very important for functional functions of the speculation of Boolean algebras.

The bibliography given on the finish of the e-book lists a few books which might be of use to the readers who are looking to learn the speculation of Boolean algebras extra thoroughly.

The writer is thankful to S. G. Gindikin for precious suggestion and to F. I. Kizner for the thoroughness and initiative in enhancing the e-book.

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**Sample text**

It is also clear that the number (x <8> z) © (у ® z) = max {min [x, z], min [y, z]} is equal to the same value (see again Fig. 13). Analogously, the number (x <8> y) © z = max {min [x, y], z} is equal to z if at least one of the numbers x and у is less than z and is equal to the minimum of the numbers x and у if both x and у exceed z (Fig. 14,a and b). As is seen from the same Fig. 14, the number (x © z) <8> (у © z) = min {max [x, z], max [y, z]} is also equal to the same value. Now to make sure that all the laws of the algebra of sets hold for the n:w unusual algebra of maxima and minima it is sufficient to note that the role of the elements О and I of the algebra of sets is played by the smallest number 0 among all the numbers under consideration and by the greatest number 1 respectively.

For the "algebra of maxima and minima" (Example 3 on page 28) the relation гз coincides with the relation ;>: we assume that two elements x and у of this algebra are connected by the relation x ZD у if the number x is not less than the number у (for instance, we have 1/2 ZD 1/3 and 1 ZD 1 in this case) 1 ). Finally, in the "algebra of least common multiples and greatest common divisors" (Example 4 on page 31) the relation m ZD n means that the number n is a divisor of the number m; for instance, in this case we have 42 ZD 6 while the numbers 42 and 35 are incomparable in this algebra (that is neither of the relations 42 ZD 35 and 42 cz 35 takes place).

Use this principle to form a new inequality from tne inequality in Exercise 8 (d). 53 11. Verify all the properties of the relation ZD for (a) the "algebra of maxima and minima"; (b) the "algebra of least common multiples and greatest common divisors". 12*. Let some sets A and В be such t h a t A zd В. Simplify the following expressions: (a) A + B; (b) AB; (c) A + B\ (d) AB 4. Sets and Propositions. Propositional Algebra Let us come back to the Boolean algebra of sets which plays the most important role in the present book.