openwebwork/pg — pull request #89 by dpvc (2014-01-26 16:55:22+00:00)
Title: Patch several small issues with MathObjects

These are several small items from the forum or bugzilla that I've fixed.

1. Use parentheses around a complex number when it is subtracted from something (so `z-(1+3i)` rather than `z-1+3i`).

2. Have `Formula->cmp(diagnostics=>1)` use `$PG->debug_message()` rather than `warn` so that its HTML output will be properly formatted.

3. Fix `ImplicitPlane` object so that it can be used properly in Lists.