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MathGroup Archive 1990

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oh come on!!

  • To: mathgroup at yoda.ncsa.uiuc.edu (mathgroup for mathematica)
  • Subject: oh come on!!
  • From: Steven Warwick <uunet!hpsadsdw.hp.com!sdw>
  • Date: Tue, 28 Aug 90 19:06:03 PDT

Another case of "does this make sense?"

Let's experiment with Limit....

In[36]:= 1 + 1/(x+a)

             1
Out[36]= 1 + -
             x

In[37]:= Limit[%,x->Infinity]

Out[37]= 1            ********* ho hum **********

In[38]:= 1 + 1/(1+a)

               1
Out[38]= 1 + -----
             1 + x

In[39]:= Limit[%,x->Infinity]

Out[39]= 1            ************** yawn **********

In[42]:= 1 + 1/( x+a)

               1
Out[42]= 1 + -----
             a + x

In[43]:= Limit[%,x->Infinity]

Out[43]= 1       ****************  zzzzzzz  ***********

In[45]:= 1 + 1/(b x)

                1
Out[45]= 1 + -------
             a + b x

In[46]:= Limit[%,x->Infinity]

                    1
Out[46]= 1 + ----------------   ************** what???? *************
             a + b (Infinity)


                                 *** so, maybe the multiplication's **
                                 *** got mma upset **

In[47]:= 1 + 1/(b x)

              1
Out[47]= 1 + ---
             b x

In[48]:= Limit[%,x->Infinity]

Out[48]= 1                  *****  nope, just another one of those days ****
 

Is there a consistantcy problem here, or is this just
a new form of computer generated cream of wheat 
       (with the lumps like mom used to make.. )




-
Steven Warwick

Hewlett-Packard
sdw at hpsad


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