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

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  • $\begingroup$ Possible duplicates: physics.stackexchange.com/q/4068/2451 and links therein. $\endgroup$ – Qmechanic Jan 15 '13 at 6:16
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    $\begingroup$ You might get better answers if you ask mathematicians... $\endgroup$ – user1504 Jan 15 '13 at 13:19
  • $\begingroup$ The Wick rotation comes to mind ... $\endgroup$ – Dilaton Jul 30 '13 at 19:06