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| Tags: | - |
| References: | - |
| Formula: | $P = -[[\frac{\partial}{\partial x} \wedge \frac{\partial}{\partial y} \wedge \frac{\partial}{\partial z} \wedge \frac{\partial}{\partial w}, u_1], u_2]$ where $u_1, u_2 \in C^\infty(\mathbb{R}^4)$ are arbitrary. |
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