{\displaystyle {\mathcal {S}}} of subsets of a set X {\displaystyle X} , an exact cover is a subcollection S ∗ {\displaystyle {\mathcal {S}}^{*}} of S {\displaystyle...

all sudokus. Sudoku puzzles may be described as an exact cover problem, or more precisely, an exact hitting set problem. This allows for an elegant description...

from Set cover. Exact cover problem is to choose a set cover with no element included in more than one covering set. Red-blue set cover. Set-cover abduction...

Algorithm X is an algorithm for solving the exact cover problem. It is a straightforward recursive, nondeterministic, depth-first, backtracking algorithm...

the exact cover problem. Algorithm X is a recursive, nondeterministic, depth-first, backtracking algorithm that finds all solutions to the exact cover problem...

that no two instances of the same digit are in the same row or column. Exact cover Consider a matrix with one primary column for each of the n ranks of...

used. For example, Knapsack was shown to be NP-complete by reducing Exact cover to Knapsack. Satisfiability: the boolean satisfiability problem for formulas...

paths and cycles 7.2.2.5. Cliques 7.2.2.6. Covers (Vertex cover, Set cover problem, Exact cover, Clique cover) 7.2.2.7. Squares 7.2.2.8. A potpourri of...

an exact 2-cover which is not a union of two covers. The first example above is an exact 1-cover (also called an exact cover). Another exact cover in...

\choose n}.} Wikimedia Commons has media related to Set partitions. Exact cover Block design Cluster analysis List of partition topics Lamination (topology)...

Exact Audio Copy (EAC) is a CD ripping program for Microsoft Windows. The program has been developed by Andre Wiethoff since 1998. Wiethoff's motivation...

satisfiability problem Conjunctive Boolean query: SR31  Cyclic ordering Exact cover problem. Remains NP-complete for 3-sets. Solvable in polynomial time...

In graph theory, a vertex cover (sometimes node cover) of a graph is a set of vertices that includes at least one endpoint of every edge of the graph...

Cover your ass (British: cover your arse), abbreviated CYA, is an activity done by individuals to protect themselves from possible subsequent criticism...

before being released, giving cover artists enough time for session musicians and computer experts to record a near-exact cover version of the song. For example...

developed by XMOS Capacitive reactance or XC, a property of a capacitor Exact cover problem, in theoretical computer science Xeno-canto, citizen science...

forest cover in India by state. Tree density is the quantification of how closely the trees are growing in a hectare area. It is not the exact number...

sequence § Spectral sequence of an exact couple. For a basic example, see Bockstein spectral sequence. The present article covers additional materials. Let R...

number of such sets. The maximum set packing need not cover every possible element. In the exact cover problem, every element of U {\displaystyle {\mathcal...

densiometer, and hemispherical photography. Exact cover measurements should be made in vertical direction, or the cover percent will be overestimated. Aerial...

to CW complexes. Suppose that B is path-connected. Then there is a long exact sequence of homotopy groups ⋯ → π n ( F ) → π n ( E ) → π n ( B ) → π n...

polynomials Dobinski's formula Cumulant Data clustering Equivalence relation Exact cover Knuth's Algorithm X Dancing Links Exponential formula Faà di Bruno's...

astronauts, Al Bishop (the "Bishop Covers"). Especially in the case of the MSCSC Covers, there are many of the exact covers that the stamp collectors also...

In data science, sameAs or exactMatch is a method of indicating that the subject of, or entity represented by, two resources is considered to be one and...

for their 2006 album Specification.Fifteen. Deupree called U2's cover "nearly an exact rip-off" and stated that for the band to obtain the rights to the...

the cover have no vertices in common, the cover is called vertex-disjoint or sometimes simply disjoint cycle cover. This is sometimes known as exact vertex...

3-dimensional matching is not only a set packing, but also an exact cover: the set M covers each element of X, Y, and Z exactly once. The proof is by reduction...

"Duck and cover" is a method of personal protection against the effects of a nuclear explosion. Ducking and covering is useful in offering a degree of...

extent to which a locally exact sequence on a fixed topological space, for instance the de Rham sequence, fails to be globally exact. Its definition, using...

Langford pairings for a given n can be solved as an instance of the exact cover problem, but for large n the number of solutions can be calculated more...