Series is taking too long

• To: mathgroup at yoda.physics.unc.edu
• Subject: Series is taking too long
• From: Roque Donizete de Oliveira <oliveria at engin.umich.edu>
• Date: Fri, 22 Jan 93 03:15:27 -0500

```There must be something wrong with Series.
It took about 3 seconds to evaluate the first example
below but it never evaluated the second example (I killed
it after 10 minutes). I duplicated the problem many times.
I was the only one using the machine (no background jobs either).

ulam% math
Mathematica 2.1 for DEC RISC
-- Terminal graphics initialized --

In[1]:= Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,7}]
Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,7}]

4       6
2   8 z    16 z        8
Out[1]= -2 + 4 z  - ---- + ----- + O[z]
3      15

In[2]:= Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,9}]
Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,9}]

Thanks for any help.

Roque
oliveria at engin.umich.edu

```

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