Some remarks on the paper of Callias. (English) Zbl 0409.58019


58J20 Index theory and related fixed-point theorems on manifolds
81T08 Constructive quantum field theory


Zbl 0388.47032
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[3] Hörmander, L.: The Weyl calculus of pseudo-differential operators (to appear) · Zbl 0388.47032
[4] Seeley, R.T.: Fredholm differential operators onR n . Preprint, Battelle Institute (1969)
[5] Taylor, M.: Gelfand theory of pseudo-differential operators and hypoelliptic operators. Trans. Am. Math. Soc.153, 495-510 (1971) · Zbl 0207.45402
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