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linear algebra and sub spaceslet T_k be all polynomials with degree 3 or under such that k is their coefficient sum. so we can say that exist at least 2 values of k for them T_k is the sub vector space of P_3(x)? i think this statment is false for example for k=2,4 we have T_k polynomials but T_k is not close under scalar multipication is this true??? am i right? |

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