The sets A + A0, B + B0, together, form the complete intersection, with f = 0, of a composite **adjoint** curve of order m + k, consisting of the **adjoint** curve of order m through A + B, together with the non-**adjoint** curve ω = 0; and the set B + B0 consists of p points, and lies on i + j **adjoint** φ-curves of f = 0.

1933, H. F. Baker, Principles of Geometry, volume 5, published 2010, page 103