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PhD Thesis

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(−1) ip(i0+...+ip−1)+p aipai0 ⊗ . . . ⊗ aip−1.<br />

Observación. Se verifica que ∂ ◦ ∂ = 0, b ◦ b = 0, ∂ ◦ b − b ◦ ∂.<br />

Definición 1.72. Definamos el complejo de Hochschild del A.D.G (A, ∂)<br />

como el complejo total de<br />

<br />

T (A) : C20<br />

.<br />

.<br />

<br />

<br />

<br />

C21<br />

<br />

C22<br />

<br />

· · ·<br />

∂<br />

∂<br />

b<br />

b<br />

b<br />

<br />

<br />

<br />

C10<br />

<br />

C11<br />

C12<br />

<br />

−∂ −∂<br />

b<br />

b<br />

b<br />

<br />

<br />

<br />

C00<br />

<br />

C01<br />

C02. <br />

∂<br />

∂<br />

.<br />

· · ·<br />

· · ·<br />

Acá Cpq := Cp,q(A). La homología de Hochschild del A.D.G (A, ∂) se define<br />

como HHn(A, ∂) := Hn(T ot(T (A))).<br />

Definición 1.73. Definamos B : Cp,q(A) → Cp+1,q(A) como<br />

p<br />

B(ai0 ⊗ ai1 ⊗ . . . ⊗ aip) = (−1) e(j) 1 ⊗ aij ⊗ . . . aip ⊗ ai0 ⊗ . . . ⊗ aij−1 ,<br />

j=0<br />

donde e(j) = jp + p<br />

ih( <br />

ik).<br />

h=j<br />

k=h<br />

Observación. Se verifica que b ◦ B + B ◦ b = B ◦ ∂ − ∂ ◦ B = 0; y B ◦ B = 0.<br />

Definición 1.74. Definamos el complejo cíclico del A.D.G (A, ∂) como<br />

.<br />

<br />

T ot(T (A))2 <br />

b+d<br />

<br />

T ot(T (A))1<br />

b+d<br />

<br />

T ot(T (A))0.<br />

<br />

B<br />

.<br />

<br />

T ot(T (A))1 <br />

<br />

T ot(T (A))0<br />

25<br />

B<br />

.<br />

<br />

T ot(T (A))0

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