smichr/sympy — comment on commit d404ec0a2f7b843e10d3e73a59fd89fd50d0ec5d
File: sympy/core/tests/test_arit.py line 1295
By mrocklin:

Are i and j here sqrt(-1) or are they symbols that lie somewhere along the imaginary line. My understanding is that this sympy command means the latter in which case I don't think these tests show correct behavior.

Couldn't j be -sqrt(-1) just as easily as sqrt(-1)? In that case we shouldn't make statements about j*oo being + or - I*oo.

Also, unless the symbols i,j really are defined as sqrt(-1) it would be better to choose different names as each of these is often used to represent sqrt(-1)