ExpIntegralEi. Notations. Primary definition. Specific values. Traditional name. Traditional notation. Mathematica StandardForm notation
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1 ExpItegralEi Notatios Traditioal ame Expoetial itegral Ei Traditioal otatio Ei Mathematica StadardForm otatio ExpItegralEi Primary defiitio Ei k k 2 log log k Specific values Values at fixed poits Ei0 Values at ifiities Ei Ei Ei Π Ei Π Ei
2 2 Geeral characteristics Domai ad aalyticity Ei is a aalytical fuctio of which is defied over the whole complex -plae Ei Symmetries ad periodicities Mirror symmetry Ei Ei Periodicity No periodicity Poles ad essetial sigularities The fuctio Ei has a essetial sigularity at. At the same time, the poit is a brach poit ig Ei. Brach poits The fuctio Ei has two brach poits: 0,. At the same time, the poit is a essetial sigularity Ei 0, Ei, 0 log Ei, log Brach cuts The fuctio Ei is a sigle-valued fuctio o the -plae cut alog the iterval, 0 where it has discotiuities from both sides Ei, 0, lim Eix Ε Eix Π ; x 0 Ε lim Eix Ε Eix Π ; x 0 Ε0
3 3 Series represetatios Geeralied power series Expasios at geeric poit 0 For the fuctio itself arg Π Ei Ei 0 Π 2 log 0 arg 0 log 0 log 0 log log ; arg Π Ei Ei 0 Π 2 log 0 arg 0 log 0 log 0 log log O arg Π Ei Ei 0 Π arg 0 log 0 log 0 2 log 0 log 0 log 0 k 0 k k k, 0 0 k arg Π Ei Ei 0 Π arg 0 log 0 log 0 2 log k kj jk log 0 log k 0 j 0 k j arg Π Ei Ei 0 Π arg 0 log 0 log 0 2 log 0 log 0 log 0 0 k k j 0 j j 0 j k j 0 k arg Π Ei Ei 0 Π arg 0 log 0 log 0 2 log 0 log 0 log 0 k k k 0 0 2F 2, ; 2, 2 k; 0 0 k k k
4 arg Π Ei Ei 0 Π 2 log 0 log 0 log 0 arg 0 log 0 log 0 O 0 Expasios o brach cuts For the fuctio itself arg Π Ei Eix Π 2 Π arg x Π x x x x x 2 x 2 x 2 ; x x x arg Π Ei Eix Π 2 Π arg x Π x x x x x 2 x 2 x 2 O x 3 ; x x Ei Eix Π Π arg Π 2 Π arg x k x k k, x x k ; x x 0 k Ei Eix Π Π arg Π 2 Π arg x k kj x jk x x k ; x x 0 k j j Ei Eix Π Π arg Π 2 Π arg x k x k j 0 j j x j k j x k ; x x Ei Eix Π Π arg Π 2 Π arg x k x k k xk k 2F 2, ; 2, 2 k; x x k ; x x arg Π Ei Eix Π 2 Π arg x Π O x ; x x 0 Expasios at 0 For the fuctio itself Ei 2 log log Ei 2 log log ; O Ei 2 log log k k k
5 Ei log k k k Π arg Π 0 True Ei 2 F 2, ; 2, 2; 2 log log Ei 2 log log O ; Ei F ; F 2 log log k 2 Ei k 0 k 2 k 2 2 2F 2, 2; 3, 3; Summed form of the trucated series expasio k k k Ei j k 2 log log j Asymptotic series expasios Ei 2 log log log log 2 6 ; Ei 2F 0, ; ; 2 log log log log ; Ei 2 log log log log k 0 k ; k Ei k Π sgim ; k k Ei 2 log log log log O ; Ei Π Π arg 0 arg Π arg 0 ; True
6 Ei Π arg Π 2 Π Π arg Π 2 ; True Residue represetatios Ei 2 log log res s j 0 s 2 s s j s Ei log 2 log log res s s s s 0 res s j s s j s Other series represetatios L Eix x k x ; x 0 k 0 k Itegral represetatios O the real axis Of the direct fuctio t Ei t 0 t 2 log log t Eix t ; x x t x t Eix t ; x t Cotour itegral represetatios Ei 2 log Ei 2 log log log 2Π s s2 s 2 2Π Γ Γ s s 2 s s s 2 s s ; Γ 0 arg Π 2
7 Ei log 2 log Ei log 2 log log 2Π s2 s s s log Γ s 2 2Π Γ s s s ; 0 Γ arg Π 2 Cotiued fractio represetatios Ei Π sgim ; arg Π Ei Π sgim k k 2, 2 k ; arg Π Ei Π sgim ; arg Π Ei Π sgim k k 2, 2 k ; arg Π Differetial equatios Ordiary liear differetial equatios ad wroskias For the direct fuctio itself w 3 2 w w 0 ; w c Ei c 2 Ei c 3
8 W, Ei, Ei w 3 2 w w 0 ; w c Ei c 2 Shi c W, Ei, Shi w 3 2 w w 0 ; w c Ei c 2 Chi c W, Ei, Chi w 3 2 g g 3 g g w g 2 3 g 2 2 g g 2 g g3 g w 0 ; w c Eig c 2 Eig c W Eig, Eig, 2 g w 3 2 g 3 h g h g 2 4 h g g h g 2 3 g g w 6 h 2 3 g 2 6 h g h 2 g 2 h g 2 g g 3 h h g3 g w 6 h 3 4 g h 2 6 g h 2 6 h h 3 g 2 h 2 h g 2 g h h 3 g h 2 h 2 g h 2 h g 2 g h 3 g h h g 3 h g g 2 h h 3 h w 0 ; w c Eig h c 2 Eig h c 3 h W h Eig, h Eig, h 2 h3 g 3 g w 3 r 3 s 3 2 w a 2 r 2 2 r 3 s 2 r 2 r s 3 s w s a 2 r 2 2 r s 2 r s w 0 ; w c s Eia r c 2 s Eia r c 3 s W s Eia r, s Eia r, s 2 a r 3 3r3 s w 3 logr 3 logs w a 2 log 2 r r 2 3 log 2 s 2 logr logs w logs a 2 log 2 r r 2 log 2 s logr logs w 0 ; w c s Eia r c 2 s Eia r c 3 s
9 W s Eia r, s Eia r, s 2 a r s 3 log 3 r Trasformatios Trasformatios ad argumet simplificatios Argumet ivolvig basic arithmetic operatios Ei Ci Si log 2 log log Ei Ci Si log 2 log log Ei 2 Ei 2 log log log log 2 Shi Related trasformatios Eilog li Complex characteristics Real part ReEix y Chix logx 2 logx2 y 2 j y 2 j2 j 0 2 j 2 j 2 F 2 j ; x2, j 2; 2 4 x j y 2 j j 0 2 j 2 j F 2 j 2 ; 3 2, j 3 2 ; x ReEix y 2 logx2 y 2 k k x k y 2 x 2 k2 cos k ta y x ReEix y j y 2 j x k2 j 2 logx2 y 2 k 2 j k 2 j k 2 j 0 ReEix y 2 Ei x x y2 Ei x x y2 x 2 x 2
10 0 Imagiary part ImEix y 20 k y 2 k x 2 k 2 k 0 F 2 k ; 3 x2 20, k 2; 2 4 k y 2 k k 0 2 k 2 k F 2 k 2 ; 2, k 3 2 ; x2 4 2 ta x, y ta x, y y2 ImEix y k k x k x 2 k2 si k ta y x 2 ta x, y ta x, y j y 2 j x ImEix y k 2 j k 2 j 2 ta x, y ta x, y k j 0 k2 j ImEix y x y2 Ei x x y2 Ei x x y2 2 y x 2 x 2 x 2 Absolute value Eix y Ei x x y2 x 2 Ei x x y2 x 2 Argumet argeix y ta 2 Ei x x y2 x 2 Ei x x y2 x 2, x y2 Ei x x y2 Ei x x y2 2 y x 2 x 2 x 2 Cojugate value Eix y 2 Ei x x y2 Ei x x y2 x 2 x 2 x y2 Ei x x y2 Ei x x y2 2 y x 2 x 2 x 2 Sigum value
11 sgeix y y2 x Ei x x y2 Ei y2 x x Ei y2 x x Ei x x y2 y x 2 x 2 x 2 x 2 x 2 2 Ei x x y2 x 2 Ei y2 x 2 x x Differetiatio Low-order differetiatio Ei Ei 2 2 Symbolic differetiatio Ei k k Ei ; k k Ei 2 log log log, ; Ei Ei Boole 0, k k k k k 0 ; Ei Ei Boole 0,, ; Ei 2 F 2, ; 2, 2 ; ; Fractioal itegro-differetiatio Α Ei Α Α 2 F 2, ; 2, 2 Α; Α Α log Α Α 2 log log Itegratio
12 2 Idefiite itegratio Ivolvig oly oe direct fuctio Eib a b a Eib a ba a Eia Eia a a Eia Eia a a Ei Ei Ivolvig oe direct fuctio ad elemetary fuctios Ivolvig power fuctio Ivolvig power Liear argumet Α Eia Α Α, a a Α Eia Α Α Eia Α Α Α, a a Α Eia Α Ei Α Α Α, Α Ei Eia a2 Eia 2 a a 2 a Eia a 3 F 3,, ; 2, 2, 2; a log 2 Eia 2 0, a log 2 loga Eia a Eia a 2
13 3 Eib a a b Eia b a Eib a b Power argumets Α Eia r Α Α Α r, a r a r Α r Eia r Ivolvig expoetial fuctio Ivolvig exp Liear argumet b Eia b Eia Eia b b a Eia loga a Eia a Power argumets a r Eia r 2 r a r r r, a r log r a 0, 2 loga r loga r 2 G 2,2 2,3 a r r 0, 0, r Ivolvig expoetial fuctio ad a power fuctio Ivolvig exp ad power Liear argumets b Eia b b b k a b k k, a b Eia b Eia, b ; k a Eia a a k Eia, a log k k ;
14 b Eia b ab a b b b Eia a b Eia b b 2 a b b Eia b 3 b b b 2 Eia 2 Eia b a a b 2 b2 b ab b b 3 a b b Eia b 4 b b b b 6 Eia 6 a a b 3 b3 Eia b b ab b b 6 a 2 b 2 b b 5 a b 2 b b Α a Eia 2 Α Α, a 2 loga loga log a a Α Α G 2,2 2,3 a 0, Α 0, 0, Α a Eia a a k Eia, a log k k ; a Eia a a a Eia log a c Eib a a c 2 a c b c a ac ba a a c a c a b c Ei a c b a a a a c c b a c Eib a a Eia Eia 2 2 Power argumets Α a r Eia r Α 2 r a r Α r Α r, a r log r a 0, Α 2 loga r loga r 2 G 2,2 2,3 a r r 0, 0, Α r Ivolvig trigoometric fuctios Ivolvig si cosb Eia Eia b Eia b sib Eia 2 b
15 5 Ivolvig cos Eia b Eia b 2 Eia sib cosb Eia 2 b Ivolvig trigoometric fuctios ad a power fuctio Ivolvig si ad power b sib Eia 2 b b k b a k k, b a Eia b Eia, b k b k b a k k, a b Eia b Eia, b k ; sib Eia Eia b Eia b 2 Eia sib b cosb 2 b a a cosb b sib 2 b 2 a 2 b sib Eia a a 2 a 2 b 2 a 3 b 2 cosb b 2 a b 2 a 2 b 2 2 a a 2 2 b 2 sib b Eia b b 3 a 2 b 2 2 a 2 b 2 2 Eia b Eia b cosb 2 b sib sib Eia Eia b 6 b 4 b2 2 cosb 3 b sib 3 Eia b Eia b a 2 b 2 3 a2 b 2 3 b a a a 2 b b 2 a 2 b 2 a 2 5 b 2 b 2 2 a 3 a 4 8 b 2 a 2 9 b 4 cosb b 2 a 3 a 4 6 b 2 a 2 a 2 b 2 3 a 2 7 b 2 a b 4 b 2 a 2 b sib Ivolvig cos ad power
16 cosb Eia 2 b b k b a k k, b a b Eia b Eia, b k b k b a k k, a b Eia b Eia, b k ; cosb Eia Eia b Eia b 2 b a a sib b cosb 2 Eia cosb b sib 2 b 2 a 2 b cosb Eia a a 2 a 2 b 2 a 3 b 2 sib b 2 a b 2 a 2 b 2 2 a a 2 2 b 2 cosb b b 3 a 2 b 2 2 a 2 b 2 2 Eia b Eia b Eia 2 b cosb b sib cosb Eia b 4 a 2 b 2 3 b2 a 3 a 4 6 b 2 a 2 a 2 b 2 3 a 2 7 b 2 a b 4 b 2 a 2 b cosb 3 Eia b Eia b b a 2 b 2 3 a a a 2 b b 2 a 2 b 2 a 2 5 b 2 b 2 2 a 3 a 4 8 b 2 a 2 9 b 4 sib Eia 3 b cosb b b sib Ivolvig hyperbolic fuctios Ivolvig sih coshb Eia Eia b Eia b sihb Eia 2 b siha Eia a a Eia Ei2 a loga 2 a Ivolvig cosh Eia b Eia b 2 Eia sihb coshb Eia 2 b
17 Chi2 a loga 2 Eia siha Shi2 a cosha Eia 2 a Ivolvig hyperbolic fuctios ad a power fuctio Ivolvig sih ad power sihb Eia 2 b b k b a k k, b a Eia b Eia, b k b k a b k k, a b Eia b Eia, b k ; sihb Eia 2 a Eia, a, a 2 k k, 2 a a k Ei2 a log k k k ; sihb Eia Eia b Eia b 2 Eia b coshb sihb 2 b a b sihb a coshb 2 b 2 a 2 b sihb Eia a a 3 a 2 b 2 a 3 b 2 coshb b 2 a b 4 4 a b 2 a 2 b 2 2 a 3 sihb b Eia b b 3 a 2 b 2 2 a 2 b 2 2 Eia b Eia 2 b sihb b coshb sihb Eia 3 Eia b Eia b b 4 a b 3 a b 3 b2 a 2 3 b a a a 2 b b 2 a 4 6 b 2 a 2 5 b 4 b 2 2 a 3 a 4 8 b 2 a 2 9 b 4 coshb b 2 a 3 a 4 6 b 2 a 2 3 a 4 0 b 2 a 2 7 b 4 a b 4 b 2 a 2 b sihb Eia b b coshb 3 b sihb Ivolvig cosh ad power
18 coshb Eia 2 b b k b a k k, b a Eia b Eia, b k b k a b k k, a b Eia b Eia, b k ; coshb Eia 2 a Eia, a, a 2 k k, 2 a a k Ei2 a log k k k ; coshb Eia Eia b Eia b 2 Eia b sihb coshb 2 b a b coshb a sihb 2 b 2 b 2 a coshb Eia b 3 a 3 b 2 a a 2 a b 2 sihb b 2 a b 4 4 a b 2 a 2 b 2 2 a 3 coshb b Eia b a 2 b 2 2 a 2 b 2 2 Eia b Eia b sihb 2 b coshb coshb Eia Eia b b 4 b2 2 6 sihb 3 b coshb 3 Eia b Eia b a b 3 a b 3 a2 b 2 3 b 2 a 3 a 4 6 b 2 a 2 3 a 4 0 b 2 a 2 7 b 4 a b 4 b 2 a 2 b coshb b a a a 2 b b 2 a 4 6 b 2 a 2 5 b 4 b 2 2 a 3 a 4 8 b 2 a 2 9 b 4 sihb Ivolvig logarithm Ivolvig log logb Eia Eia a a logb a logb a Ivolvig logarithm ad a power fuctio
19 9 Ivolvig log ad power Α logb Eia Α 3 Α a Α 2 F 2 Α, Α; Α, Α ; a a Α Α Eia Α logb a Α Α log Α, a Α logb log Eia log Eia log Eia 4 a 2 Eia a2 2 2 a 2 log 2 2 a a 2 2 a log 9 a 3 Eia a3 3 3 a 3 log 3 6 a a 2 2 a 3 a a 2 log 7 6 a 4 Eia a4 4 4 a 4 log 4 24 a a 3 3 a a 4 a a a 6 log 38 Ivolvig fuctios of the direct fuctio Ivolvig elemetary fuctios of the direct fuctio Ivolvig powers of the direct fuctio Eia 2 a Eia 2 2 a Eia 2 Ei2 a a Ivolvig products of the direct fuctio Eia Eia a Eia Eia a Eia a a Eia Eib a b b a Eib a Eia b b Eib a b Eia b Ivolvig fuctios of the direct fuctio ad elemetary fuctios Ivolvig elemetary fuctios of the direct fuctio ad elemetary fuctios Ivolvig powers of the direct fuctio ad a power fuctio
20 Eia 2 2a Ei2 2 k k, 2 a a Eia, a Eia 2 ; k Eia 2 a2 2 Eia 2 2 a a Eia 2 a 2 Ei2 a Eia Eia 2 2 a 2 6 a 3 2 a3 Eia a 2 a 5 4 a a a 2 Eia 8 Ei2 a 4 a 4 a4 Eia a a a 8 2 a a a a 6 Eia 2 Ei2 a Ivolvig products of the direct fuctio ad a power fuctio Eia Eib a k a b k k, a b Eia b a a Eib, a a Eia k a b b b k a b k k, a b Eia b Eia, b k ; Eia Eia a a a Eia Eia Eia, a a k a k Eia, a log log k k k k ; Eia Eib 2 a 2 b 2 Eia b b b 2 2 Eib a 2 a b ab b 2 a a Eib a 2 b 2 Eia b Eia Eia 2 a 2 a a Eia a Eia a 2 Eia 2 a a 2 a log Eia Eib a b ab 2 a 2 b a b a b a 2 b 2 3 a 3 b 3 a b a b Eia b 3 3 Eib b b b 2 2 a 3 b 3 a a a 2 2 Eib 2 a 3 b 3 Eia b
21 Eia Eia 3 a 3 a 4 a a a a 2 Eia a Eia a a a 2 a 3 3 Eia Eia Eib Eia 4 a 4 b 4 b4 Eib 4 b 6 b b b 3 6 a 4 a b a b 2 ab b b 3 6 a 4 b b 2 b 5 9 a 3 b 2 b b 5 2 a 2 3 b 3 b 3 a 6 b 4 b 4 a a a a Eib 6 a 4 b 4 Eia b Eia Eia 4 a 4 a a a a 6 Eia a Eia a a a a 6 a 4 4 Eia 3 a a log Defiite itegratio Ivolvig the direct fuctio log t Eitt ; Re 0 Itegral trasforms Laplace trasforms log t Eit ; Re Operatios Limit operatio Π 0 arga Π Π argb Π Ima 0 Π argb Π 2 2 lim Eia b x x Π 0 arga Π argb Π Π arga 0 argb Π argb Π Ima 0 argb Π True Represetatios through more geeral fuctios Through hypergeometric fuctios
22 22 Ivolvig p F q Ei 2 F 2, ; 2, 2; 2 log log Ivolvig hypergeometric U Ei U,, log 2 log log Through Meijer G Classical cases for the direct fuctio itself Ei 2 log log G,2 2,3,, 0, Ei log 2 log log G 2,0,2 0, 0 Classical cases ivolvig exp Ei 2 log 2 log log G 2,,2 0 0, Ei 2 log log Π G 2, 2,3 0, 2 0, 0, Ei Π G 2, 2,3 0, 2 0, 0, 2 ;, 0 Classical cases for products of Ei Ei Ei Π 2 G 2,4 3, 2 4 0, 0, 0, 0, 2 ; Im 0 Through other fuctios Ei 0, 2 log log log Ei E 2 log log log
23 23 Represetatios through equivalet fuctios With related fuctios Ei Chi Shi 2 log log Ei Ci Si 2 log log log Ei li ; Π Im Π Theorems The real part of the Heiseberg-Euler Lagragia of quatum electrodyamics The real part of the Heiseberg Euler Lagragia of quatum electrodyamics L eff E, B ca be expressed as the followig series. ReL eff E, B c Α Π c 2coth Π k Η 2 Ξ Ci k Ξ cos k Ξ Si k Ξ si k Ξ coth Π k Ξ Η Ei k Ξ exp k Ξ Ei k Ξ exp k Ξ ; Ξ e Π c c 2 c 2 2 Η e Π c c 2 c 2 2 c 2 E2 B 2 c 2 E B, where E is the electric field, B is the magetic iductio ad Α is the fie structure costat. The Nambu-Goldstoe modes for weakly iteractig fermios i a magetic field The Nambu-Goldstoe modes for weakly iteractig fermios i a magetic field are described by m 2 VrΨr 0, where i 3+ dimesioal ladder quatum electrodyamics the potetial Vr takes the r 2 form Vr 2l 2 Ei r2, where l is the magetic legth. 2 2l History A. M. Legedre (8) O. Schlomilch (846) F. Ardt (847) J. W. L. Glaisher (870) itroduced the otatio Ei
24 24 Copyright This documet was dowloaded from fuctios.wolfram.com, a comprehesive olie compedium of formulas ivolvig the special fuctios of mathematics. For a key to the otatios used here, see Please cite this documet by referrig to the fuctios.wolfram.com page from which it was dowloaded, for example: To refer to a particular formula, cite fuctios.wolfram.com followed by the citatio umber. e.g.: This documet is curretly i a prelimiary form. If you have commets or suggestios, please commets@fuctios.wolfram.com , Wolfram Research, Ic.
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