For any 1-forms w₁, W₂ we have w₁ ^ W₂ ^ W₁ = 0. For any 1-forms w₁, W2, W3 and scalar A ER we have (W₁ + XW3) ^ W₂2₂ ^ W3 =W₁ ^ W²₁₂ W3. For any 1-forms w₁, W2, W3 and scalar A ER we have . ولا ۸ و لا = ولا ۸ والا ۸ ۸

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