Implication details
Claim: If a category is normal, then it has zero morphisms.
Proof: This is part of our definition of a normal category.
This implication has a dual.
Show 61 categories using this implication
- discrete category on two objects
- category of finite sets and bijections
- delooping of a group
- delooping of an infinite countable group
- delooping of a non-trivial finite group
- delooping of an infinite uncountable group
- delooping of the additive monoid of natural numbers
- category of sets equipped with a binary relation
- category of sets equipped with an irreflexive binary relation
- category of sets equipped with a symmetric binary relation
- category of sets equipped with a symmetric irreflexive binary relation
- category of compact Hausdorff spaces
- simplex category
- category of F(I)-sets
- category of finite sets and injections
- category of finite sets and surjections
- category of finite ordered sets
- category of finite sets
- category of finite sets of even cardinality
- category of finite sets of odd cardinality
- category of finite sets of cardinality a power of 3
- category of Jónsson-Tarski algebras
- category of M-sets
- category of sets with a distinguished subset
- partially ordered set of extended natural numbers
- partially ordered collection of ordinal numbers
- category of partially ordered sets without isolated points
- category of preordered sets
- category of quivers
- category of quivers with finite components
- category of sequences of sets
- category of connected sequences of sets
- category of sets
- category of set functions and commutative squares
- category of sets and bijections
- category of countable sets
- discrete category of sets
- category of large families of sets
- category of large families of sets and bijections
- category of large families of sets which are mostly empty
- category of large families of sets which are mostly singletons
- category of sets with finite-to-one maps
- category of non-empty sets
- category of pairs of sets
- category of empty-or-finite pairs of sets
- category of sheaves
- category of combinatorial species
- category of Z-functors
- category of finite Z-sets
- category of Z-sets
- preordered set of integers w.r.t. divisibility
- cocompletion of a discrete–pair join
- forked commutative square
- real interval [0,1]
- category of simplicial sets
- walking commutative square
- walking composable pair
- walking coreflexive pair
- walking fork
- walking morphism
- walking parallel pair