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18b. , Pc(2/2,8) is not equal Pc(1,8). 18c: 8 3ffl ·2 ac(i/4)=J F(8)Pc(i/4,8)d8 =2 J (1- 38)Pc(i/4,8)d8 (80) 0 -2 In order to compute the limit ac(i/s) for large values of i and~' one needs PcCi/s,8) = Pc(i,8/s) forlargevalues of i and small values of 8/s. 1 ~ 0 a. 17. ac(~) is the limit curve for the polynomials stretched by a factor ~ ... =· The limit function Pc C~-t,S) and acC~) follow for s ... 17 for Legendre polynomials. 18a to c. One may readily see how the coefficients ac(i), ac(i/2) and ac(i/4) converge to acC~).

Using (49), one may approximate this area arbitrarily close for sufficiently large values of by the following integral: s F(S) = '1[2 00 J[ac(v) cos 2nv9 + a 5 (v) sin2nvS]dv (52) 0 The lower limit of the integral is zero, because the lower limit of the sum in ( 49) approaches zero. The first term of the sum (49) may be neglected, since it contributes arbitrarily little for large values of s. The variable v in (52) must assume the values of all real positive numbers and not only of denumerably many of them, or the integral could not be interpreted as a Riemann integral.

14 Walsh Functions The Walsh functions wal(0,8), sal(i,8) and cal(i,8) are of considerable interest in communications2. There is a close connection between sal and sine functions, as well as between cal and cosine functions. The letters s and c in sal and cal were chosen to indicate this connection, while the letters 'al' are derived from the name Walsh. For computational purposes it is sometimes more convenient to use sine and cosine functions, while at other times the exponential function is more convenient.

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