Published online by Cambridge University Press: 25 October 2022
We explain a classical construction of a del Pezzo surface of degree d = 4 or 5 as a smooth order 2 congruence of lines in P3 whose focal surface is a quartic surface X20-d with 20-d ordinary double points. We also show that X15 can be realized as a hyperplane section of the Castelnuovo– Richmond–Igusa quartic hypersurface in P4. This leads to the proof of rationality of the moduli space of 15-nodal quartic surfaces. We discuss some other birational models of X15: quartic symmetroids, 5-nodal quartic surfaces, 10-nodal sextic surfaces in P4 and nonsingular surfaces of degree 10 in P6. Finally we study some birational involutions of a 15- nodal quartic surface which, as it is shown in Part II of the paper jointly with I. Shimada [DS20], belong to a finite set of generators of the group of birational automorphisms of a general 15 nodal quartic surface.
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