sympy/sympy — pull request #7784 by cbm755 (2014-07-24 21:06:35+00:00)
Title: Tests: nan not orderable

In PR #7776, @Tempel thought `nan` should not be orderable, by analogy to `Lt(I,1)`.

Here's a test for that. Currently it passes. The test only includes the long forms like `Lt` not the symbolic shortcuts `<`.

The shortcuts actually fail, but that's PR #7783.