How many known Constructive QFTs are there?

  • #1
mad mathematician
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TL;DR Summary
I listed as advanced, though my questions aren't really that much advanced, but I need to choose some option, and I am way beyond basic level and intermediate.
I think 1+1,1+2 are known to exist.
1+3 is basically the Millenium prize, are there more options?

Is string theory basically QFT in disguise? just with more than 3+1 dimensions.
I guess the next Millenium (3000) prize would be to fill the gaps of Witten's M theory conjecture in his seminal paper from the nineties... :cool:
 

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