- #1
Silviu
- 624
- 11
Hello! I just started reading about ##Z_2## graded vector spaces (and graded vector spaces in general) and I want to make sure I understand from the beginning. So the definition, as I understand it, is that a graded vector space can be decomposed into subspaces of degree 0 and 1. So ##V=V_1 \oplus V_2##. I am confused about this, does this mean that ##R^2=R \oplus R## is a ##Z_2## graded vector space? And ##R^3=R^2 \oplus R##, too? And in the case of ##R^3##, does it matter the order of ##R## and ##R^2##? I see that one can define the parity reversed spaced, in which ##V_1## and ##V_2## are interchanged, so I guess it makes a difference, but I am confused why, as I thought that the direct sum is commutative. Can someone please explain this to me, in not advanced terms as I really know nothing about graded vector spaces, yet (I would really appreciate a clear example, too, in case what I said above is wrong).