How do we add elements in a quiver?
Please see here:
I know how to multiply this (by concatenation) but how do we add them, i.e how do we interpet ab - c ? I don't understand why ab- c is not an element of $R^{2}$.
How do we add elements in a quiver?
Please see here:
I know how to multiply this (by concatenation) but how do we add them, i.e how do we interpet ab - c ? I don't understand why ab- c is not an element of $R^{2}$.
Just formally, think of non-commuting variables in a polynomial ring.