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A solved Rubik's Revenge cube. The Rubik's Revenge (also known as the 4×4×4 Rubik's Cube) is a 4×4×4 version of the Rubik's Cube.It was released in 1981. Invented by Péter Sebestény, the cube was nearly called the Sebestény Cube until a somewhat last-minute decision changed the puzzle's name to attract fans of the original Rubik's Cube. [1]
The method he used is called IDA* and is described in his paper "Finding Optimal Solutions to Rubik's Cube Using Pattern Databases". [15] Korf describes this method as follows IDA* is a depth-first search that looks for increasingly longer solutions in a series of iterations, using a lower-bound heuristic to prune branches once a lower bound on ...
Cube layer A cube layer is a one-cubie-thick slice of the cube perpendicular to its axis of rotation. Outer layers (faces) contain more cubies than inner layers. For a cube of size , there will be layers along any given axis. Cube face The meaning of a cube face depends on the context in which it is used.
The book contained his own "step by step solution" for the Cube, [18] and it is accepted that he was a pioneer of the general Layer by Layer approach for solving the Cube. [19] The book also contained a catalogue of pretty patterns including his "cube in a cube in a cube" pattern which he had discovered himself "and was very pleased with". [ 20 ]
the most commonly-used half-turn metric (HTM), in which rotating a face (or outer layer) either 90° or 180° counts as a single move, but a "slice-turn" – i.e. rotating a centre layer – counts as two separate moves (equivalent to rotating the two outer layers in the opposite direction);
Cube mid-solve on the OLL step. The CFOP method (Cross – F2L (first 2 layers) – OLL (orientate last layer) – PLL (permutate last layer)), also known as the Fridrich method, is one of the most commonly used methods in speedsolving a 3×3×3 Rubik's Cube. It is one of the fastest methods with the other most notable ones being Roux and ZZ.
Valk also currently holds the world record for solving the most Rubik's cubes in 1 hour, 374 cubes, set in Paris on 21 October 2015. Valk is also known as a creator of the VLS (Valk Last Slot) 3x3x3 algorithm set, which correctly orients the last layer while inserting the last corner-edge pair of the first two layers.
The complexity of an elementary function is equivalent to that of its inverse, since all elementary functions are analytic and hence invertible by means of Newton's method. In particular, if either exp {\displaystyle \exp } or log {\displaystyle \log } in the complex domain can be computed with some complexity, then that complexity is ...