Paste number 34366: strange effect of dummy variables?

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Paste number 34366: strange effect of dummy variables?
Pasted by: amitar
2 years, 10 hours ago
#maxima
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Maxima 5.10.0 http://maxima.sourceforge.net
Using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (aka GCL)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
This is a development version of Maxima. The function bug_report()
provides bug reporting information.
(%i1) f(x):=sum(x^n/n!,n,0,inf);
                                       n
                                      x
(%o1)                           f(x) := sum(--, n, 0, inf)
                                      n!
(%i2) f(2*y);
                                  inf
                                  ====         n  n
                                  \     2  y
(%o2)                                    >    -----
                                  /         n!
                                  ====
                                  n = 0
(%i3) /* so far so good - but look here: */
f(2*x);
                                  inf
                                  ====         n  n
                                  \     4  x
(%o3)                                    >    -----
                                  /         n!
                                  ====
                                  n = 0

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Annotation number 1: reformatting (untabify)
Pasted by: amitar
2 years, 9 hours ago
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(%i1) f(x):=sum(x^n/n!,n,0,inf);
                                       n
                                      x
(%o1)                     f(x) := sum(--, n, 0, inf)
                                      n!
(%i2) f(2*y);
                                  inf
                                  ====   n  n
                                  \     2  y
(%o2)                              >    -----
                                  /      n!
                                  ====
                                  n = 0
(%i3) /* so far so good - but look here: */
       f(2*x);
                                  inf
                                  ====   n  n
                                  \     4  x
(%o3)                              >    -----
                                  /      n!
                                  ====
                                  n = 0
(%i4) /* ??????? */

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