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Proposition 20.1.43AEC81016D4BC

Proposition 20.1.43.AEC81016D4BC

  1. 413103745994

    The product in definition 20.1.41 is symmetric in its $n$ variables.

  2. E21CF2D200CF

    Let $\mathbb {D}_1,\ldots ,\mathbb {D}_ n,\mathbb {D}'_1$ be nef b-divisors over $X$. Then

    \[ \left(\mathbb {D}_1+\mathbb {D}_1',\ldots ,\mathbb {D}_ n \right)=\left(\mathbb {D}_1,\ldots ,\mathbb {D}_ n \right)+\left(\mathbb {D}_1',\ldots ,\mathbb {D}_ n \right). \]
  3. F1CD812A96DA

    Let $\mathbb {D}_1,\ldots ,\mathbb {D}_ n$ be nef b-divisors over $X$ and $\lambda \geq 0$. Then

    \[ \left(\lambda \mathbb {D}_1,\ldots ,\mathbb {D}_ n \right)=\lambda \left(\mathbb {D}_1,\ldots ,\mathbb {D}_ n \right). \]
  4. B5FA9D24DE24

    Let $\mathbb {D}_1,\ldots ,\mathbb {D}_ n$ and $\mathbb {D}'$ be nef b-divisors over $X$ such that $\mathbb {D}_1\leq \mathbb {D}'$. Then

    \[ \left(\mathbb {D}_1,\ldots ,\mathbb {D}_ n \right)\leq \left(\mathbb {D}',\mathbb {D}_2,\ldots ,\mathbb {D}_ n \right). \]
  5. 2960B6AF1379

    Let $T_1,\ldots ,T_ n$ be closed positive $(1,1)$-currents on $X$. Then

    \[ \Bigl ( \mathbb {D}(T_1),\ldots ,\mathbb {D}(T_ n) \Bigr )= \operatorname{vol}(T_1,\ldots ,T_ n). \]

Proof. 1, 2, 3 and 4 These are immediate consequences of the corresponding results in the big and nef case established in 20.1.40.

5 By (18.1.26) and (20.1.42), we may assume that $T_1,\ldots ,T_ n$ are Kähler currents. In this case, the assertion follows from the definitions. $\square$

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