Petersson trace formula

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The Steinitz exchange lemma is a basic theorem in linear algebra used, for example, to show that any two bases for a finite-dimensional vector space have the same number of elements. The result is named after the German mathematician Ernst Steinitz. The result is often called the Steinitz–Mac Lane exchange lemma, also recognizing the generalization[1] by Saunders Mac Lane of Steinitz's lemma to matroids.[2]

Statement

If {v1, ..., vm} is a set of m linearly independent vectors in a vector space V, and {w1, ..., wn} span V then m ≤ n and, possibly after reordering the wi, the set {v1, ..., vm, wm + 1, ..., wn} spans V.

Proof

We are going to show that for any integer satisfying , the following assertion is valid. Choosing gives the result.

(A) The set spans (where the have possibly been reordered, and the reordering depends on ).

We will prove (A) by induction over : Being clear for , the only thing that needs to be done is the inductive step.

Assume that (A) holds for some satisfying . Since , and spans (by the induction hypothesis), there exist such that

At least one of must be non-zero, otherwise this equality would contradict the linear independence of ; note that this additionally implies that . By reordering the , we may assume that is not zero. Therefore, we have

In other words, is in the span of and so the latter must be the whole of . We have thus shown that (A) holds for , completing the inductive step.

Applications

The Steinitz exchange lemma is a basic result in computational mathematics, especially in linear algebra and in combinatorial algorithms.[3]

References

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