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  • Null graph — In the mathematical field of graph theory, the null graph may refer either to the order zero graph, or alternatively, to any edgeless graph (the latter is sometimes called an empty graph). Contents 1 Order zero graph 2 Edgeless graph 3 See also …   Wikipedia

  • Null-O — is a 1958 science fiction short story by Philip K. Dick. This rather brief story examines the concept of totally unempathic and logical humans ( Null O s) in an obvious parody of the plot and concepts of The Players of Null A by A. E. van Vogt.… …   Wikipedia

  • Tree traversal — Graph and tree search algorithms Alpha beta pruning A* B* Beam Bellman–Ford algorithm Best first Bidirectional …   Wikipedia

  • Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… …   Wikipedia

  • Null-move heuristic — In computer chess programs, the null move heuristic is a heuristic technique used to enhance the speed of the alpha beta pruning algorithm. Contents 1 Rationale 2 Implementation 3 Problems with the null move heuristic …   Wikipedia

  • Null move — In game theory, a null move is a decision by a player to pass (that is, not to make a move) when it is their turn to move. Even though null moves are against the rules of many games, they are often useful to consider when analyzing these games.… …   Wikipedia

  • null path length — noun The path length from a given node to its nearest descendant null node in a binary tree …   Wiktionary

  • Red-black tree — A red black tree is a type of self balancing binary search tree, a data structure used in computer science, typically used to implement associative arrays. The original structure was invented in 1972 by Rudolf Bayer who called them symmetric… …   Wikipedia

  • Binary search tree — In computer science, a binary search tree (BST) is a binary tree data structurewhich has the following properties: *each node (item in the tree) has a value; *a total order (linear order) is defined on these values; *the left subtree of a node… …   Wikipedia

  • Binary tree — Not to be confused with B tree. A simple binary tree of size 9 and height 3, with a root node whose value is 2. The above tree is unbalanced and not sorted. In computer science, a binary tree is a tree data structure in which each node has at… …   Wikipedia

  • Leftist tree — A leftist tree or leftist heap is a priority queue implemented with a variant of a binary heap. Every node has an s value which is the distance to the nearest leaf. In contrast to a binary heap , a leftist tree attempts to be very unbalanced. In… …   Wikipedia

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