منابع مشابه
Certificates Talk about certificates in QE
Today we continue with some additional aspects of quantifier elimination. We will then recall the Positivstellensatz and its relations with semidefinite programming. After introducing copositive matrices, we present Pólya’s theorem on positive forms on the simplex, and the associated relaxations. Finally, we conclude with an important result due to Schmüdgen about representation of positive pol...
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In this paper, I pursue three goals. The first is to model collusion in a way that is distinct from noncooperative collusion. The second and third are to develop a particular specification of a standard model of noncooperative collusion that permits explicit solution for equilibrium outputs and reversion thresholds and to extend this analysis to allow for a deterrence-based competition policy t...
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Detection and deterrence of collusion are longstanding antitrust problems, made difficult because collusive arrangements are usually surreptitious. In this paper, I discuss factors that facilitate or inhibit collusive schemes, as well as circumstances where detection is possible. I describe how industrial organization economists diagnose collusion (both explicit and tacit) among firms.
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Within the heterogeneous independent private values model, we analyze bidder collusion at ...rst and second price single-object auctions, allowing for within-cartel transfers. Our primary focus is on coalitions that contain a strict subset of all bidders. To analyze collusion, a richer environment is required than in the analysis of non-cooperative behavior. We must account for the possibility ...
متن کاملColliding X.509 Certificates
With this construction we show that MD5 collisions can be crafted easily in such a way that the principles underlying the trust in Public Key Infrastructure are violated. In particular we find it worrying that from one certificate alone it cannot be determined whether another, different certificate may exist with the same signature. For the second certificate the issuing Certification Authority...
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An isomorphism certificate of a labeled tournament T is a labeled subdigraph of T which together with an unlabeled copy of T allows the errorless reconstruction of T . It is shown that any tournament on n vertices contains an isomorphism certificate with at most n log2 n edges. This answers a question of Fishburn, Kim and Tetali. A score certificate of T is a labeled subdigraph of T which toget...
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عنوان ژورنال:
گنجینه اسنادجلد ۱۷، شماره ۱، صفحات ۹-۱۴
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