# Talk:2–3 tree

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## Untitled

This page must be corrected. The illustrations at the top contradict the definition given. Students in my class go to pages like this, and it must be corrected immediately. Vegasprof (talk) 13:02, 16 October 2008 (UTC)

## Dubious

According to notes in "Introduction to algorithms" by Cormen (B-Trees chapter), 2-3 Trees are not B-Trees. I also found this article: http://cs.engr.uky.edu/~lewis/essays/algorithms/2-3trees/trees2-3.html ("2-3 Trees as Search Trees")

2-3 Trees have been introduced in 1970 by J.E. Hopcroft. B-Trees have appeared later in 1972 (R. Bayer and E.M. McCreight "Organization and maintenance of large ordered indexes")

B and 2-3 are so different. For example, B-Trees include data in non-leaf nodes, but 2-3 only in leaves. In B-Trees terms, tree's degree must be >= 2 -- 2-3 are trees of degree equal to 1.

If I'm right, there is incorrect information on "B-tree" page (Overview section): "For example, in a 2-3 B-tree (often simply referred to as a 2-3 tree), each internal node may have only 2 or 3 child nodes."

(E 3521 (talk) 06:07, 24 May 2010 (UTC))

The third example at the insertion section contains errors.How Si Yu (talk) 10:42, 8 November 2014 (UTC)

You are confusing B trees with B+ trees. In a B+ tree, the data is stored in the leaves. In a B tree the data is stored in the internal nodes. B trees are generalizations of 2-3 trees, and you can also have 2-3 B+ trees. Go back and read again. This has been firmly established in Computer Science for a long time now. — Preceding unsigned comment added by 132.160.49.90 (talk) 20:34, 15 March 2016 (UTC)

### Error in Definitions

The Definitions section only allow internal nodes in a 2-3 tree. It seems that instead of "L, M, and R are non-empty 2–3 trees of equal height" one should allow, L,M, and R to be empty, or perhaps a similar approach. Haskellelephant (talk) 20:36, 17 February 2017 (UTC)

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