Invertible
invertible
coproduct
Coproduct
morphism
coproducts
morphisms
preorders
Preorders
antisymmetry
antisymmetric
preorder
Preorder
semilattice
Semilattice
semilattices
Semilattices
meet-semilattice
meet-semilattices
poset
posets
Posets
Birkhoff's
superset
monoid
monoid-like
monoids
monoidal
monoid's
Monoid
Monoids
isomorphism
isomorphisms
Isomorphisms
Hasse
Antisymmetry
connexity
linearly
Heyting
modus
Modus
ponens
intuitionistic
leit
Z3
Z2
Z1
abelian
Abelian
non-abelian
Dih3
composable
forall
codomain
Euclidian
subtypes
Immanuel 
iff
concatenative
structs
DeMorgan's
getter
OOP