Added induced pcgs and exponent-vector

[divyanshu132]

Brief description of what is fixed or changed

Added induced pcgs and exponent-vector for polycyclic subgroup.

Other comments

Release Notes

• combinatorics
  • added methods to compute induced-pcgs and exp vector for pc subgroup

[sympy-bot]

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• combinatorics
  • added methods to compute induced-pcgs and exp vector for pc subgroup (#17317 by @divyanshu132)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.5.

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#### Brief description of what is fixed or changed
 Added induced pcgs and exponent-vector for polycyclic subgroup.

#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
*  combinatorics
   * added methods to compute induced-pcgs and exp vector for pc subgroup
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Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #17317 into master will decrease coverage by 7.958%.
The diff coverage is 65.789%.

@@             Coverage Diff              @@
##           master    #17317       +/-   ##
============================================
- Coverage    74.6%   66.642%   -7.959%     
============================================
  Files         626       626               
  Lines      162415    162588      +173     
  Branches    38104     38204      +100     
============================================
- Hits       121162    108352    -12810     
- Misses      35883     48874    +12991     
+ Partials     5370      5362        -8

[divyanshu132]

ping @jksuom

[jksuom]

This looks good but the coverage seems to be falling. Maybe there should be more tests.