Vacuum packing preventing the evaporation of volatile components. It is also commonly used to store dry foods over a long period of time, such as cereals, nuts, cured meats, cheese, smoked fish, coffee, and potato chips (crisps). On a more short term basis, vacuum packing can also be used to store fresh foods, such as vegetables, meats, and liquids, because it inhibits bacterial growth. Vacuum packing greatly reduces the bulk of non-food items. For example, clothing and bedding can be stored in bags evacuated with a domestic vacuum cleaner or a dedicated vacuum sealer. This technique is sometimes used to compact household
Packing in a hypergraph a hypergraph packing if it is a subset of edges in H such that there is no pair of distinct edges with a common vertex. formula_2 is a (formula_3,formula_4)-good hypergraph if there exists a formula_3 such that for all formula_6 and formula_7 and both of the following conditions hold. where the "degree" deg("x") of a vertex "x" is the number of edges that contain "x" and the "codegree" codeg("x", "y") of two distinct vertices "x" and "y" is the number of edges that contain both vertices. There exists an asymptotic packing "P" of size at least formula_10 for a formula_11-uniform