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- "File EXP_INT.MTH, copyright (c) 1990-2000 by Texas Instruments Incorporated"
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- EI(x,m):=euler_gamma+LN(x)+SUM(x^n_/(n_*n_!),n_,1,m)
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- LI(x,m):=EI(LN(x),m)
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- EN(n,z):=INT(#e^(-z*t_)/t_^n,t_,1,inf)
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- EN_ASYMP(n,z,m):=#e^(-z)/z*SUM(PERM(n+l_-1,l_)/(-z)^l_,l_,0,m)
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- EI1(z,m):=-euler_gamma-LN(z)-SUM((-z)^n_/(n_*n_!),n_,1,m)
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- SI(z):=INT(SIN(t_)/t_,t_,0,z)
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- CI(z):=euler_gamma+LN(z)+INT((COS(t_)-1)/t_,t_,0,z)