11.07.2015 Views

International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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Heat Kernels and the Index Theorems • • • 363Now, for simplicity, we assume that the elliptic operator D is <strong>of</strong> order one.Then by a standard result, which goes back to Minakshisundaram and Pleijiel [MP],one has that when t > 0 tends to 0,Pt(x,x) = (a- n + a- n+ it +••• + a Q t n + o x (t n j), (2.5)(4nt) nwhere a* G End ((E © F) x ), i = -n,..., 0.By (2.2)', (2.4) and (2.5), and by taking t > 0 small enough, one deduces that/ Tr 8 [ai]dx = 0, -n

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