Structure Associativity Identity Inverse Commutativity Abelian group under + Distributivity No zero divisors Idempotence (·) Invertibility of nonzero elements char > 0 Total order (≤) Dense order Discrete order Typical examples
Structure Commutativity (∧,∨) Associativity (∧,∨) Idempotence (∧,∨) Absorption (∧,∨) Modularity Distributivity Boundedness (0,1) Complement (a') Uniqueness of a' Completeness (⋀S,⋁S) Atomicity Partial order (≤) Linearity (chain) Typical examples