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Integrate[Exp[-(1-x)^2]/Sqrt[x],{x,0,Infinity}]

• To: mathgroup@smc.vnet.net
• Subject: [mg10584] Integrate[Exp[-(1-x)^2]/Sqrt[x],{x,0,Infinity}]
• From: Andrea Bellettini <andrea@lebesgue.fees.hokudai.ac.jp>
• Date: Tue, 20 Jan 1998 16:54:22 -0500
• Organization: Hokkaido University

Can someone explain the following behavior?

In[48]:= $Version

Out[48]= HP9000 Series 700 2.2 (May 7, 1993)

In[49]:= Integrate[Exp[-(1-x)^2]/Sqrt[x],{x,0,Infinity}]

On::none: Message SeriesData::csa not found.

         I      2          1  1
Out[49]= - Sqrt[-] BesselK[-, -]
         2      E          4  2

In[50]:= N@%

Out[50]= 0.411862 I

In[51]:= NIntegrate[Exp[-(1-x)^2]/Sqrt[x],{x,0,Infinity}]

Out[51]= 1.97373

What is the meaning of csa?

Thanks for any help

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