There are a number of useful properties relations could have. Here are just a few:1. Reflexive: 每个元素都和它自己有关系2. Irreflexive: 集合里的任意元素都和它自己没关系。1个元素和它自己有关系,2个元素和它自己没关系,既没有Reflexive属性,也没有Irreflexive属性。3. Transitive: x R y 且 y R...
property of "totality" means that any pair of elements in the set of the relation are comparable under the relation.This also means that the set can be diagrammed as a line of elements, giving it the name linear .[2] Totality also implies reflexivity, i.e., a ≤ a . Therefore, ...
property of "totality" means that any pair of elements in the set of the relation are comparable under the relation.This also means that the set can be diagrammed as a line of elements, giving it the name linear .[2] Totality also implies reflexivity, i.e., a ≤ a . Therefore, ...
di Duration of activity i ∊ N, a positive integer δi Due date of activity i ∊ N, a positive integer wi Weight date of activity i ∊ N, a positive integer A (strict) Partial order on N, an irreflexive and transitive relation imposing the constraints fi⩽fj-dj for all (i, ...
The output of some tasks constitutes the input of some others; thus, there is finish-to-start precedence relation between some pairs of tasks, represented by set A, i.e. a (strict) partial order on N. If si indicates the start time of task i, set A is defined as an irreflexive and...