Über gewisse G-stabile Teilmengen in pojektiven Räumen.
Über Ptolemäische Sätze.
Ueber algebraische Flächen, die zu einander apolar sind.
Ueber die Bildung der Resultante zweier Gleichungen
Ueber die Flächen, deren Gleichungen aus denen ebener Curven durch eine bestimmte Substitution hervorgehen
Ueber die Formen der Curven dritter Ordnung.
Ueber die mechanische Erzeugung von Curven
Ueber die verschiedenen Formen der Bedingungsgleichung, welche ausdrückt, dass sechs Punkte auf einem Kegelschnitte liegen.
Ueber dreipunktig berührende Curven einer dreifach unendlichen Schaar
Un analogue local du theoreme de Harnack.
Un teorema sui sistemi lineari di quadriche irriducibili di prima e seconda specie
Una osservazione sulla curva di Cremona di
Unique decomposition for a polynomial of low rank
Let F be a homogeneous polynomial of degree d in m + 1 variables defined over an algebraically closed field of characteristic 0 and suppose that F belongs to the sth secant variety of the d-uple Veronese embedding of into but that its minimal decomposition as a sum of dth powers of linear forms requires more than s summands. We show that if s ≤ d then F can be uniquely written as , where are linear forms with t ≤ (d-1)/2, and Q is a binary form such that with ’s linear forms and ’s forms...
Uniqueness of Steiner laws on cubic curves.
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Updown numbers and the initial monomials of the slope variety.
Vanishing theorems and degeneracy loci in small corang. (Théoremès d'annulation et lieux de degenerescence en petit corang.)
Varieities with low dimensional dual variety.
Varieties of minimal rational tangents of codimension 1
Let be a uniruled projective manifold and let be a general point. The main result of [2] says that if the -degrees (i.e., the degrees with respect to the anti-canonical bundle of ) of all rational curves through are at least , then is a projective space. In this paper, we study the structure of when the -degrees of all rational curves through are at least . Our study uses the projective variety , called the VMRT at , defined as the union of tangent directions to the rational curves...
Varieties with an extremal number of degenerate higher secant varieties.