Free matroid
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In mathematics, the free matroid over a given ground-set E is the matroid in which the independent sets are all subsets of E. It is a special case of a uniform matroid; specifically, when E has cardinality , it is the uniform matroid .[1] The unique basis of this matroid is the ground-set itself, E. Among matroids on E, the free matroid on E has the most independent sets, the highest rank, and the fewest circuits.

Every free matroid with a ground set of size n is the graphic matroid of an n-edge forest.[2]
Free extension of a matroid
The free extension of a matroid by some element , denoted , is a matroid whose elements are the elements of plus the new element , and:
References
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