On some properties of partial intersection schemes

Autores: Alfio Ragusa, Giuseppe Zappalà
Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 54, Fasc. 3, 2003, págs. 255-268
Idioma: inglés
Títulos paralelos:
- Algunas propiedades de los esquemas de intersección parcial
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Resumen
- Partial intersection subschemes of Pr of codimension c were used to furnish various graded Betti numbers which agree with a fixed Hilbert function. Here we study some further properties of such schemes; in particular, we show that they are not in general licci and we give a large class of them which are licci. Moreover, we show that all partial intersections are glicci. We also show that for partial intersections the first and the last Betti numbers, say m and p respectively, give bounds each other; in particular, in codimension 3 case we see that [(p+5)/2] = m = 2p+1 and each m and p satisfying the above inequality can be realized.