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Montrer que \(\forall (x, y, z)\in (\Rr^{3})^{3} \; \; x\wedge (y\wedge z) + y\wedge (z\wedge x) + z\wedge (x\wedge y) = 0\).
Montrer que \(\forall (x, y, z)\in (\Rr^{3})^{3} \; \; x\wedge (y\wedge z) + y\wedge (z\wedge x) + z\wedge (x\wedge y) = 0\).