On a theorem of de Bruijn and Erdös
1979
Abstract A theorem of de Bruijn and Erdos [2] asserts that every finite geometry (see section 1 for definition) has at least as many lines as points. The present paper uses linear algebra as a technique to establish the de Bruijn-Erdos result and a particular higher dimensional generalization. These results are special cases of theorems due to Basterfield and Kelly [1] and Green [3].
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