The other aspect is seen in the presence of a quadratic form "Q" on "V"; if it is non-degenerate it allows an identification of the dual space "V"* of "V" with "V". The relation of "V"* to "V" is not intrinsic; it depends on a choice of Haar measure (volume element) on "V". But given an identification of the two, which is in any case well-defined up to a scalar, the presence of "Q" allows one to speak to the dual lattice to "L" while staying within "V".