Hausdorff formula for anticommutation

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SUMMARY

The Hausdorff formula for anticommutation is distinct from that for commutation. When dealing with anticommuting quantities A and B, the relationship simplifies to exp(A) = 1 + A, as higher-order powers vanish due to the property A^2 = 0 = B^2. The sign of the exponentials in the Hausdorff formula for anticommutation is indeed positive, confirming the user's initial assumption. This clarification is crucial for accurately applying the formula in quantum mechanics and related fields.

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mary1900
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hello. it's the first time I use this site I hope that I find the answer of my question: does the hausdorff formula for anti commutation have the same formula for commutation?
 
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I think the sign of the two exponentials must be positive,is it correct?
exp(A) B exp(A)= B + {A,B} + {A,{A,B}} +...
 
mary1900 said:
hello. it's the first time I use this site I hope that I find the answer of my question: does the hausdorff formula for anti commutation have the same formula for commutation?
If A and B are anti-commuting quantities, then I presume you also mean ##A^2=0 =B^2## ?

If so, then ##\exp(A) = 1 + A## (since higher order powers vanish). That simplifies all formulas considerably...
 

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