Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

What aspects of "conventional" quantum field theory (i.e. what's used by most practicing physicists) are considered to be lacking mathematical rigor?

share|cite|improve this question

closed as not constructive by David Z Jan 15 '13 at 4:49

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

Possible duplicates: and links therein. – Qmechanic Jan 15 '13 at 6:16
You might get better answers if you ask mathematicians... – user1504 Jan 15 '13 at 13:19
The Wick rotation comes to mind ... – Dilaton Jul 30 '13 at 19:06