quotient quiver
Let Q=(Q0,Q1,s,t) be a quiver.
Definition. An equivalence relation on Q is a pair
∼=(∼0,∼1) |
such that ∼0 is an equivalence relation on Q0, ∼1 is an equivalence relation on Q1 and if
α∼1β |
for some arrows α,β∈Q1, then
s(α)∼0s(β) and t(α)∼1t(β). |
If ∼ is an equivalence relation on Q, then (Q0/∼0,Q1/∼1,s′,t′) is a quiver, where
s′([α])=[s(α)] |
This quiver is called the quotient quiver of by and is denoted by .
It can be easily seen, that if is a quiver and is an equivalence relation on , then
given by , where and are quotient maps is a morphism of quivers. It will be called the quotient morphism.
Example. Consider the following quiver
If we take by putting and , , then the corresponding quotient quiver is isomorphic to
Title | quotient quiver |
---|---|
Canonical name | QuotientQuiver |
Date of creation | 2013-03-22 19:17:22 |
Last modified on | 2013-03-22 19:17:22 |
Owner | joking (16130) |
Last modified by | joking (16130) |
Numerical id | 4 |
Author | joking (16130) |
Entry type | Definition |
Classification | msc 14L24 |