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Chapter II.  Numeric functions and their properties 
 
1-§. 
     function.....…...............................................................................................14 
2-§.   Integer and fractional part of a real number……...............................................14 
3-§. Functions representing the number and sum of divisors of a Natural  Number ..17 
4-§.  Euler function ….................................................................................................19 
 
Chapter III.  Elements of the Theory of Comparisons 
 
1-§. Comparisons and their basic properties...............................................................22 
2-§.  Deduction classes for this module……...............................................................25
 
3-§. Eulеr va Farm theorems...………………………………........………................29 
 
Chapter IV.  Comparisons with one unknown 
 
1-§. Comparisons with one unknown (general concepts)…........................................31 
2-§. Comparisons of the first degree with one unknown …........................................33 
3-§.  Systems Comparison of the first degree with one unknown...............................36 
4-§. Comparison of higher degrees in a simple module ….........................................40 
5-§. Comparison of higher degrees in composite modulus ……................................44 
6-§. Comparisons of the second degree and Legendre symbol….......………………47