102,282 research outputs found
Il contratto e gli strumenti finanziari partecipativi
No full textIl capitolo del volume "I contratti per l'impresa" si inserisce nella parte dedicata ai contratti in ambito societario e tratta specificatamente del contratto mediante il quale vengono emessi gli strumenti finanziari partecipativi ai sensi dell'art. 2346 c.c.
Il capitolo, oltre a dare una spiegazione delle principali scelte legislative, si incentra sulla questione inerente la possibilità di individuare una figura contrattuale, ulteriore e diversa rispetto al contratto sociale, per quanto ad esso collegato, dalla quale traggono origine gli SFP.
Il lavoro rappresenta lo sviluppo di una ricerca sul tema della struttura finanziaria della della s.p.a., tema lungo il quale l'Autore ha pubblicato diversi contributi dopo la riforma del diritto societario del 2003 e sul quale è riconosciuto quale uno dei più autorevoli esperti.
Stante la data di pubblicazione dell'opera (fine 2012), non sono al momento disponibili citazioni e recensioni
On the Gorenstein locus of some punctual Hilbert schemes
No full textLet be an algebraically closed field and let \Hilb_{d}^{G}(\p{N}) be the open locus of the Hilbert scheme \Hilb_{d}(\p{N}) corresponding to Gorenstein subschemes. We prove that \Hilb_{d}^{G}(\p{N}) is irreducible for . Moreover we also give a complete picture of its singular locus in the same range . Such a description of the singularities gives some evidence to a conjecture on the nature of the singular points in \Hilb_{d}^{G}(\p{N}) that we state at the end of the pape
Even G-liaison classes of some unions of curves
No full textAbstractAfter establishing bounds on the Rao function and on the genus of projective curves that generalize the ones in [5] and in [12], we describe the even G-liaison classes of some unions of curves attaining the bounds, and of more general unions with analogous geometric properties. In particular, we prove that their Hartshorne–Rao module identifies the even G-liaison class
On the irriducibility and singularities of the Gorenstein locus of the punctual Hilbert scheme of degree 10
No full textLet be an algebraically closed field of characteristic and let \Hilb_{d}^{G}(\p{N}) be the open locus of the Hilbert scheme \Hilb_{d}(\p{N}) corresponding to Gorenstein subschemes. We proved in a previous paper that \Hilb_{d}^{G}(\p{N}) is irreducible for and . In the present paper we prove that also \Hilb_{10}^{G}(\p{N}) is irreducible for each , giving also a complete description of its singular locu
On systematic and GR effects on muon g − 2 experiments
No full textWe derive in full generality the equations that govern the time dependence of the energy E of the decay electrons in a muon g − 2 experiment. We include both electromagnetic and gravitational effects and we estimate possible systematics on the measurements of a ≡ (g − 2)/2, whose experimental uncertainty will soon reach ∆a/a ≈ 10−7 . In addition to the standard modulation of E when the motion is orthogonal to a constant magnetic field B, with angular frequency ωa = ea|B|/m, we study effects due to: (1) a non constant muon γ factor, in presence of electric fields E, (2) a correction due to a component of the muon velocity along B (the “pitch correction”), (3) corrections to the precession rate due to E fields, (4) non-trivial spacetime metrics. Oscillations along the radial and vertical directions of the muon lead to oscillations in E with a relative size of order 10−6 , for the BNL g − 2 experiment. We then find a subleading effect in the “pitch” correction, leading to a frequency shift of ∆ωa/ωa ≈ O(10−9 ) and subleading effects of about ∆ωa/ωa ≈ few × O(10−8–10−9 ) due to E fields. Finally we show that GR effects are dominated by the Coriolis force, due to the Earth rotation with angular frequency ωT , leading to a correction of about ∆ωa/ωa ≈ ωT /(γωa) ≈ O(10−12). A similar correction might be more appreciable for future electron g − 2 experiments, being of order ∆ωa/ωa,el ≈ ωT /(ωa,el) ≈ 7 × 10−13, compared to the present experimental uncertainty, ∆ael/ael ≈ 10−10, and forecasted to reach soon ∆ael/ael ≈ 10−1
On the Gorenstein locus of the punctual Hilbert scheme of degree 11
No full textLet k be an algebraically closed field of characteristic 0 and let Hilb_d^G(P_k^N) be the open locus of the Hilbert scheme Hilb_d(P_k^N) corresponding to Gorenstein subschemes. We proved in several previous papers that Hilb_d^G(P_k^N) is irreducible for d⩽10 and N⩾1, characterizing its singular locus. In the present paper we prove that also Hilb_{11}^G(P_k^N) is irreducible for each N⩾1. We also give some results about its singular locus
Remarks on degree 4 projective curves
No full textIn this paper we characterize the degree 4 multiple lines with generic embedding dimension 3 and among them the ones with very degenerate hyperplanc section, and the ones which contain a degree 3 planar subcurve. Using that characterization, we prove that the degree 4 curves containing a planar subcurve of degree 3 are the general element of all irreducible component of the Hilbert scheme. Moreover, we show that all the multiple lines we consider belong to the same connected component of the corresponding Hilbert scheme
Canonical curves with low apolarity
No full textAbstractLet k be an algebraically closed field and let C be a non-hyperelliptic smooth projective curve of genus g defined over k. Since the canonical model of C is arithmetically Gorenstein, Macaulayʼs theory of inverse systems allows us to associate to C a cubic form f in the divided power k-algebra Rg−3 in g−2 variables. The apolarity ap(C) of C is the minimal number t of linear form ℓ1,…,ℓt∈Rg−3 needed to write f as the sum of their divided power cubes.It is easy to see that ap(C)⩾g−2 and P. De Poi and F. Zucconi classified curves with ap(C)=g−2 when k≅C. In this paper, we give a complete, characteristic free, classification of curves C with apolarity g−1 (and g−2)
The Poicaré series of a local Gorenstein ring of multiplicity up to 10 is rational
No full textWe prove the rationality of the Poincaré series for a certain class of local Gorenstein rings
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