 Because the curves meet in a single point, , neither of their homology classes is a proper multiple of some other homology class, and hence they form a basis of "H"1.The period matrix for this family is therefore
The first entry of this matrix we will abbreviate as "A", and the second as "B".The bilinear form "Q" is positive definite because locally, we can always write ω as "f dz", hence
By Poincaré duality, γ and δ correspond to cohomology classes γ* and δ* which together are a basis for .