(1) Let w1, be a k-form and w2 be an l- form, both defined in an open subset UC R3. Let d : /\k (...

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$(1) Let w1, be a k-form and w2 be an l- form, both defined in an open subset UC R3. Let d : /\k (U)-ל ЛК +1 (U) be the exteri$

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(1) Let w1, be a k-form and w2 be an l- form, both defined in an open subset UC R3. Let d : /\k (...

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