“…This is precisely the definition of the knot invariant which was introduced and studied in [39,40,41] (see also [42,43]). This invariant, sometimes called Casson-Lin invariant, is well-defined away from the roots of the Alexander polynomial of K and turns out to be equal to the linear combination of more familiar invariants, α ∈ [0, 1], λ α (Y ; K) was constructed in [44] (see also [45,46]) and, therefore, is expected to be the same as (3.8).…”