exponential integral function

• 1. 指数积分函数: expint | exponential integral function
• 2. 指数函数积分表: list of integrals of exponential functions

• 1.本文对电磁场问题的理论计算中常遇到的含有指数函数和指数积分函数的积分，得出了解析表达式。
  The analytical expressions are derived for the integrals containing exponential and exponential integral which appear frequently in electromagnetic field problems.
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• 2.指数型间断函数具有在数学上的便于积分和求导的优点，且比阶梯间断函数更能反映实际破裂后的变形情况。
  That discontinuous function is not only convenient for integral and derivative, but also can be better reflect the displacement character after crack than heaviside function.
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• 3.系统的性能函数是含有指数项和故障输入项的积分二次型函数。
  The cost function of the systems is given in terms of integral quadratic function including both index exponent and failure controls.
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