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  1. "File EXP_INT.MTH, copyright (c) 1990-2000 by Texas Instruments Incorporated"
  2.  
  3. EI(x,m):=euler_gamma+LN(x)+SUM(x^n_/(n_*n_!),n_,1,m)
  4.  
  5. LI(x,m):=EI(LN(x),m)
  6.  
  7. EN(n,z):=INT(#e^(-z*t_)/t_^n,t_,1,inf)
  8.  
  9. EN_ASYMP(n,z,m):=#e^(-z)/z*SUM(PERM(n+l_-1,l_)/(-z)^l_,l_,0,m)
  10.  
  11. EI1(z,m):=-euler_gamma-LN(z)-SUM((-z)^n_/(n_*n_!),n_,1,m)
  12.  
  13. SI(z):=INT(SIN(t_)/t_,t_,0,z)
  14.  
  15. CI(z):=euler_gamma+LN(z)+INT((COS(t_)-1)/t_,t_,0,z)
  16.