Let s = a + it be a complex variable, and let L(s, X) denote the Dirichlet L-function. For L-functions there exist limit theorems which characterize the behavior of L-functions when the modulus of character increases. To state these theorems we need some notation. Let, for Q 7> 2, Z 1 p<~Q X=X (mod p) X~Xo where p denotes a prime number and X0 is the principal character. From the prime number theorem it is easy to deduce that Q2 BQ2Here and further on B denotes a number (not always the same) which is bounded by a constant. We put
= F, I2p<~Q X=x(mod p) X 7~Xo ....
,where in place of dots we indicate a condition satisfied by a pair (p,)~ (rood p)). When L (s, X) ~ O, 1/2 < a <~ 1, denote by argL(s, X) the value of the argument of L(s, X) defined by continuous displacement from the point s = 2 along an arc on which l(s, X) does not vanish. Define a distribution function (mod 1) FQ(X) = vQ(argL(s, X)/2rc < x(mod 1)).Then in [1] the following theorem was obtained.THEOREM 1. At each point s in the half-plane a > 1/2 the distribution function (mod 1) FQ(X) converges as Q --+ oo to a continuous distribution function (mod 1) defined by the Fourier transform ,
~=, \ m ] p2=~]Here (:t:km/2) denotes the binomial coefficients.