Meld (cards) Meld (cards) In card games, a meld is a set of matching cards, typically three or more, that earn a player points and/or allow him to deplete his hand. Melds typically come in sequences of ascending cards belonging to the same suit known as "runs" () or "sets/groups" of cards of identical rank (). Other ones may be "marriage" (e.g. K and Q) and "bezique" (Q and J). Melding is typical in games of the Rummy family, such as Canasta and Gin. It is also used in other games such as mahjong. Melds are also made in some trick-taking games,
Partition of a set into the connected components of the subgraph formed by the given set of edges. In this way, the lattice of partitions corresponds to the lattice of flats of the graphic matroid of the complete graph. Another example illustrates the refining of partitions from the perspective of equivalence relations. If "D" is the set of cards in a standard 52-card deck, the "same-color-as" relation on "D" – which can be denoted ~ – has two equivalence classes: the sets {red cards} and {black cards}. The 2-part partition corresponding to ~ has a refinement that yields the "same-suit-as" relation ~, which has