Abstract
A warning and a reflection: The material I propose to cover in these four lectures is quite large, and ideas from different fields in mathematical physics must be combined. Therefore not all the details will be explained. I have tried to select proofs for presentation according to their technical simplicity and elegance. This should not mislead you to believe that mathematical physics is a simple thing. Some of the most outstanding and admirable recent results of, say, constructive quantum field theory (e.g. [GJ1] [GRS] [GJS1] [OS]; see also [CQFT]) require an enormous amount of sophisticated and hard analysis. These results concern the existence of relativistic quantum fields and their detailed properties, e.g. their non-triviality, (in the sense that the scattering matrix is different from the identity [EEF, OSé]). The fact that the proofs of many of these results are very hard and intricate may seem or be unpleasant.
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