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单词 Steinitz exchange lemma
释义
Steinitz exchange lemma

Mathematics
  • Let V be a vector space and v1,…,vm, w1,…,wnV. If the vi are linearly independent and the wi span V, then, with some possible reordering of the wi,

    {v1,,vm,wm+1,,wn}

    spans V. Thus, each vi can be introduced one at a time in exchange for some wj and consequentially m ≤ n. This implies all bases of V have the same cardinality and that the dimension of V is well defined.


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