Az Egri Ho Si Minh Tanárképző Főiskola Tud. Közleményei. 1987. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 18/13)

Tamás Franczia: An analytical method for calculating multicentre integrals built up from GTF-S I

- 43 a, (2) d 1 , ex. Z +a. Z 1 2 — £ +—LE_P ct Q + rl

2 - y a. +a • L ' J p kq -J a. +a. 1 * J p kq Multiplying (25) with exp 2+

r) 2+K 2JJ w

e ^

or

m integrandus expressed with the < >< arguments and not containing any constant multipliers in front of the sign of the integration. Further on we will disregard the constant multipliers because it is possible to expound the principles of the beginning of the calculation disregarding them. The integration in (15) was J

f[

ri]

d ri - type and we have OD transformed it to the jFCp)d

3p form, where p = , rj J

, d

3p = CD d< . dr? - d< i TK<2 JVcp) d p integration means simple integrations OO on the <',17',*;' arguments from -co to + cd in each case. It is allowed to begin the integration with that variable we want to, because the limits of the three single integrations are constants. So let us begin with the integration on j*' .In this case the two other variables are to be considered as constants. The form of the integral on <is the