Master Dissertation
Master Dissertation
Master Dissertation
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equal powers must have equal coefficients. We conclude that for every m, n<br />
<br />
<br />
=<br />
d 4 x1 · · · d 4 xnTn(x1, . . . , xn)g2(x1) · · · g2(xm)g1(xm+1) · · · g1(xn)<br />
d 4 x1 · · · d 4 xnTm(x1, . . . , xm)Tn−m(xm+1, . . . , xn)<br />
× g2(x1) · · · g2(xm)g1(xm+1) · · · g1(xn) (5.5)<br />
Further note that from the calculus of the tensor product<br />
〈T2, (f1 + f2) ⊗ (f1 + f2)〉 = 〈T2, f1 ⊗ f1〉 + 〈T2, f1 ⊗ f2〉<br />
+ 〈T2, f2 ⊗ f1〉 + 〈T2, f2 ⊗ f2〉,<br />
FIXME: maybe better to write it out in n dimensions<br />
and since Tm is symmetric<br />
〈Tm, f1 ⊗ f2〉 = 1<br />
2 (〈Tm, (f1 + f2) ⊗ (f1 + f2)〉 − 〈Tm, f1 ⊗ f1〉<br />
− 〈Tm, f2 ⊗ f2〉). (5.6)<br />
Now for transparency and to get a good idea of how to prove Theorem 5.1<br />
let us prove it for n = 3 and m = 2. That is,<br />
Claim. 〈T3, f1 ⊗ f2 ⊗ f3〉 = 〈T2, f1 ⊗ f2〉〈T1, f3〉.<br />
Proof. By 5.6<br />
Hence by 5.5<br />
〈T2, f1 ⊗ f2〉 = 1<br />
〈T2, (f1 + f2) ⊗ (f1 + f2)〉 − 〈T2, f1 ⊗ f1〉<br />
2<br />
− 〈T2, f2 ⊗ f2〉 <br />
〈T2, f1 ⊗ f2〉〈T1, f3〉<br />
= 1<br />
〈T3, (f1 + f2) ⊗ (f1 + f2) ⊗ f3〉 − 〈T3, f1 ⊗ f1 ⊗ f3〉<br />
2<br />
− 〈T3, f2 ⊗ f2 ⊗ f3〉 <br />
= 1<br />
〈T3, f1 ⊗ f1 ⊗ f3〉 + 〈T3, f2 ⊗ f2 ⊗ f3〉 + 2〈T3, f1 ⊗ f2 ⊗ f3〉<br />
2<br />
− 〈T3, f1 ⊗ f1 ⊗ f3〉 − 〈T3, f2 ⊗ f2 ⊗ f3〉 <br />
= 〈T3, f1 ⊗ f2 ⊗ f3〉.<br />
Which proves the claim.<br />
Now before proving this for arbitrary n and m we need the following<br />
lemma.<br />
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