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Matchbook cover, World War II, Uncle Sam. A "matchcover", or "matchbook cover", is a thin cardboard covering that folds over match sticks in a "book" or "pack" of matches. Covers have been used as a form of advertising since 1894, two years after they were patented, and since then, have attracted people who enjoy the hobby of collecting.
Matchbook is the debut solo studio album by Australian singer-guitarist, Ian Moss, a member of pub rockers, Cold Chisel. Six of its ten tracks were written by fellow Cold Chisel bandmate, Don Walker, and three were co-written by Moss and Walker. The album was released in August 1989 and peaked at number 1 on the ARIA Albums Chart; it remained ...
More formally, given a universe and a family of subsets of , a set cover is a subfamily of sets whose union is . In the set cover decision problem, the input is a pair and an integer ; the question is whether there is a set cover of size or less. In the set cover optimization problem, the input is a pair , and the task is to find a set cover ...
Covering problems. In combinatorics and computer science, covering problems are computational problems that ask whether a certain combinatorial structure 'covers' another, or how large the structure has to be to do that. Covering problems are minimization problems and usually integer linear programs, whose dual problems are called packing ...
The exact cover problem is NP-complete and is one of Karp's 21 NP-complete problems. It is NP-complete even when each subset in S contains exactly three elements; this restricted problem is known as exact cover by 3-sets, often abbreviated X3C. Knuth's Algorithm X is an algorithm that finds all solutions to an exact cover problem.
The maximum coverage problem is a classical question in computer science, computational complexity theory, and operations research . It is a problem that is widely taught in approximation algorithms . As input you are given several sets and a number . The sets may have some elements in common. You must select at most of these sets such that the ...
Covering relation. The Hasse diagram of the power set of three elements, partially ordered by inclusion. In mathematics, especially order theory, the covering relation of a partially ordered set is the binary relation which holds between comparable elements that are immediate neighbours. The covering relation is commonly used to graphically ...
Social Security isn't enough. ‘Ramsey Show’ hosts tell broke 86-year-old Florida woman with almost $30,000 in credit card debt she has only one option.