Introduction to Lattices and Order 1 Orderd Sets の Orderd sets
1.1 Order
一般的な順序の例から、順序の紹介。
transitivity, antisymmetric, strict, non-strict, comparabilityについて軽く。
1.2 Definitions
orderの定義。reflexivity, antisymmetry, transitivity。
ordered set (= partially ordered set = poset)
discrete order(=だけ)
1.3 Chains and antichains
Chain = linearly ordered set = totally ordered set
n-element のchainをnの太字であらわす。
1.4 Order-isomorphisms
要素についてbijectiveで、順序を保存すればorder-isomorphism。
当然inverseが常にあってそれもorder-isomorphism。
1.6 Families of sets