series yields wrong result

[dkrenn]

The following was posted on the public bug reports from the notebook interface by Clemens Heuberger on 1/4/2011 and on sage-support. In the latter other code examples were posted.

f.series(q,2) for the f defined below yields Order(q^2) which is incorrect, as f.subs(q=0) equals 1 (which is correct).

sage: var('q')
sage: f=(q^13362120470/((q - 1)*(q^5 - 1)*(q^21 - 1)*(q^85 - 1)*(q^341 -
1)*(q^1365 - 1)*(q^5461 - 1)*(q^21845 - 1)*(q^87381 - 1)*(q^349525 -
1)*(q^1398101 - 1)*(q^5592405 - 1)*(q^22369621 - 1)*(q^89478485 -
1)*(q^357913941 - 1)*(q^1431655765 - 1)*(q^5726623061 - 1)) +
1)/(q^7635497409/((q - 1)*(q^5 - 1)*(q^21 - 1)*(q^85 - 1)*(q^341 -
1)*(q^1365 - 1)*(q^5461 - 1)*(q^21845 - 1)*(q^87381 - 1)*(q^349525 -
1)*(q^1398101 - 1)*(q^5592405 - 1)*(q^22369621 - 1)*(q^89478485 -
1)*(q^357913941 - 1)*(q^1431655765 - 1)*(q^5726623061 - 1)) + 1)
sage: f.subs(q=0)
1
sage: f.series(q,2)

CC: @cheuberg @rwst

Component: symbolics

Keywords: series, order, symbolics

Stopgaps: todo

Issue created by migration from https://trac.sagemath.org/ticket/12589

[dkrenn]

Description changed:

--- 
+++ 
@@ -1,4 +1,4 @@
-The following was posted by Clemens Heuberger on [the public bug reports from the notebook interface](https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA) and on [sage-support](http://groups.google.com/group/sage-support/browse_thread/thread/2949e7c3d0e84ef/852fabf0229526ed). In the latter other code examples were posted.
+The following was posted on [the public bug reports from the notebook interface](https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA) by Clemens Heuberger on 1/4/2011 and on [sage-support](http://groups.google.com/group/sage-support/browse_thread/thread/2949e7c3d0e84ef/852fabf0229526ed). In the latter other code examples were posted.
 
 `f.series(q,2)` for the `f` defined below yields `Order(q^2)` which is incorrect, as `f.subs(q=0)` equals `1` (which is correct).
 

[dkrenn]

comment:6

Still there in 6.6.