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Take into account branch cut for Pow/Log series #140

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merged 4 commits into from Jan 31, 2016

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skirpichev commented Dec 1, 2015

See Sec. 7.4 of the Gruntz thesis.

In [3]: limit(sqrt(-1 + I*x), x, 0)
Out[3]: ⅈ

In [4]: limit(sqrt(-1 - I*x), x, 0)
Out[4]: -

TODO:

  • fix tests
  • add missing as_leading_term
  • support branch cut for log too, e.g.this
  • cleanup

Relevant sympy's issues:
sympy/sympy#7216

@skirpichev skirpichev force-pushed the pow-series branch from f7d896d to 776b71d Dec 6, 2015

@skirpichev skirpichev force-pushed the pow-series branch from 18ffde3 to 2ceeed7 Dec 18, 2015

@skirpichev skirpichev added wrong answer and removed bug labels Dec 20, 2015

@skirpichev skirpichev force-pushed the pow-series branch from 2ceeed7 to 6c8034e Jan 13, 2016

@skirpichev skirpichev changed the title Take into account branch cut for Pow series expansion Take into account branch cut for Pow series Jan 13, 2016

@skirpichev skirpichev force-pushed the pow-series branch 2 times, most recently from eb5ae62 to 3577c6f Jan 16, 2016

@skirpichev skirpichev force-pushed the pow-series branch from 862ee24 to 5aa5994 Jan 26, 2016

@skirpichev skirpichev changed the title Take into account branch cut for Pow series Take into account branch cut for Pow/Log series Jan 30, 2016

@skirpichev skirpichev force-pushed the pow-series branch from 60f6fc7 to 7035847 Jan 30, 2016

skirpichev added a commit that referenced this pull request Jan 31, 2016

Merge pull request #140 from skirpichev/pow-series
Take into account branch cut for Pow/Log series

@skirpichev skirpichev merged commit 6b3ae84 into master Jan 31, 2016

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coverage/coveralls Coverage increased (+0.02%) to 92.63%
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@skirpichev skirpichev deleted the pow-series branch Jan 31, 2016

@skirpichev skirpichev modified the milestone: 0.8.0 Sep 9, 2016

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