Asymptotic Expansion of Multiple Integrals And the Method of Stationary Phase
Asymptotic Expansion of Multiple Integrals And the Method of Stationary Phase
Douglas S Jones
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By integration, d2-l(F, d2. T)"-l/2 2^_^ ^in, n " 2in + 2n " SSTST ^^m, n-l f°r n > 1, derivatives of all orders. Hence it may be neglected because it will not con- tribute to the asymptotic expansion of J, Continuing the integration we obtain I - (-l)"(2n-l)(2n-3)... 1 ^ ^ m, n ( km+i;n; ( 2m+i;n-i! ) . . . ( 2mV^ ) ^ \, o * Further, m, o ^20 20 "'"■'■ >0 — Once again the first term may be neglected insofar as contribution to the asympto- tic expansion is concerned, so that T - (2'"-l)(^-3)...... L /* T ■Sn, c 2m(5m-2)... 2 m "^0, 0 Since „ -, 2 1, d > (d^ - T/F, )^-^^ ^0, 0 " ^17^ ^°s -[TTiTr— 17? F20 1^1 ^20 and since the numerator in the logarithmic factor will not contribute to the asymptotic expansion, the significant part of I^ ^ is given by 27 - (m-fn)l?nF2j Therefore the relevant part of h^Ct-F^^, ) i£ U Y" ::!_ ^ ^" (-1)'' r-m- r-r-w (t-F^^) ?To at'" tMD Il^b ^^02^"^02^^ v-..^, .^-.. 20 p-0 q'=0 Since we can ignore continuous functions with continuous derivatives we can replace ^ (t-F, )^*^loglt-F, | by if p + q - i.
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