Latex parsing of not equal, less than, greater than

[bhpayne]

References to other Issues or PRs

no issues related to neq in Latex

Brief description of what is fixed or changed

added support for \neq in Latex based on @iammosespaulr 's work, and expanded less than, greater than support in Latex

Other comments

Release Notes

• parsing
  • added Latex support for "not equal" and expanded support for less than, greater than symbols

[sympy-bot]

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• parsing
  • added Latex support for "not equal" and expanded support for less than, greater than symbols (#19970 by @bhpayne)

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#### References to other Issues or PRs
no issues related to neq in Latex

#### Brief description of what is fixed or changed
added support for \neq in Latex based on @iammosespaulr 's work, and expanded less than, greater than support in Latex

#### Other comments


#### Release Notes

<!-- BEGIN RELEASE NOTES -->
* parsing
  * added Latex support for "not equal" and expanded support for less than, greater than symbols
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[bhpayne]

The failed test appears to be a timeout

The job exceeded the maximum time limit for jobs, and has been terminated.

[bhpayne]

I tested this branch locally on my computer using both

>>> sympy.test()
>>> sympy.test("sympy/parsing/tests/test_latex.py")

The first took 2 hours; the second took 4.5 seconds. Both passed.

[oscarbenjamin]

I've restarted the test that timed out. Maybe it's just a momentary problem on the test server

[codecov]

Codecov Report

Merging #19970 into master will decrease coverage by 17.612%.
The diff coverage is 0.000%.

@@              Coverage Diff               @@
##            master    #19970        +/-   ##
==============================================
- Coverage   75.832%   58.219%   -17.613%     
==============================================
  Files          669       669                
  Lines       173451    173504        +53     
  Branches     40903     40908         +5     
==============================================
- Hits        131532    101014     -30518     
- Misses       36196     66141     +29945     
- Partials      5723      6349       +626     

[czgdp1807]

Is it good to merge? @iammosespaulr @oscarbenjamin