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- Thread starter Tangent87
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- #1

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- #2

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What's [itex][AB,CD][/itex] equal to?

- #3

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What's [itex][AB,CD][/itex] equal to?

Ah, thanks latentcorpse!

[tex][AB,CD]=A[B,CD]+[A,CD]B=A[B,C]D+AC[B,D]+[A,C]DB+C[A,D]B[/tex]

Also, if I want to show [tex]\sum_{r=0}^\infty (-1)^r K_r=|0><0|[/tex] is it sufficient to show [tex]\sum_{r=0}^\infty (-1)^r K_r|n>=|0><0|n>=0[/tex]?

- #4

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redundant

- #5

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Ah, thanks latentcorpse!

[tex][AB,CD]=A[B,CD]+[A,CD]B=A[B,C]D+AC[B,D]+[A,C]DB+C[A,D]B[/tex]

Also, if I want to show [tex]\sum_{r=0}^\infty (-1)^r K_r=|0><0|[/tex] is it sufficient to show [tex]\sum_{r=0}^\infty (-1)^r K_r|n>=|0><0|n>=0[/tex]?

No wait of course it's not, what am I thinking!

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