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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
Two days ago, I created
One reason was (I keep this notification short) something like
I am working, for pasting schemes, on plane digraphs -> working with embeddings becomes important -> a central theorem about plane graphs is of course Whitney’s theorem about unique embeddability of 3-connected planar graphs -> arguably the most well-known, but heretofore not nLab-documented theorem about planar 3-connected graphs is a theorem of Steinitz’s.
The exchange axiom for pregeometries is sometimes called the Steinitz exchange axiom (after its specialization to vector spaces, where it is sometimes known as the Steinitz exchange lemma.)
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