Added more Tests
Added more tests and changed the name of Plane.equal method to Plane.is_coplanar
Code cleanup
Merge https://github.com/sympy/sympy into plane
Changed a test which resulted in the error
misc
Merge pull request #3 from smichr/geom

misc changes
Fixed issues with the tests
Changed map() to list(map())
Added a test and changed list() to list(set())
return S.Zero and other stylistic changes
modify how perpendicular plane is computed
Merge pull request #4 from smichr/geom

Geom
Merge pull request #7733 from akshayah3/plane

Added more Tests to the Plane class.