107,324 research outputs found
The Geometry of (t mod q)-arcs
Full text linkIn this paper, we give a geometric construction of the three strong non-lifted (3 mod 5)-arcs in PG(3, 5) of respective sizes 128, 143, and 168, and construct an infinite family of non lifted, strong (t mod q)-arcs in PG(r, q) with t = (q + 1)/2 for all r = 3 and all odd prime powers q
General T. J. (Stonewall) Jackson Kurz & Allison print of General T. J. (Stonewall) Jackson
No full textKurz & Allison print of General T. J. (Stonewall) Jackson, b&w auction estimates (Oct 2015) $500 to 750https://mds.marshall.edu/blake_collection/1097/thumbnail.jp
The Positivication of Coalgebraic Logics
Full text linkWe present positive coalgebraic logic in full generality, and show how to obtain a positive coalgebraic logic from a boolean one. On the model side this involves canonically computing a endofunctor T': Pos->Pos from an endofunctor T: Set->Set, in a procedure previously defined by the second author et alii called posetification. On the syntax side, it involves canonically computing a syntax-building functor L': DL->DL from a syntax-building functor L: BA->BA, in a dual procedure which we call positivication. These operations are interesting in their own right and we explicitly compute posetifications and positivications in the case of several modal logics. We show how the semantics of a boolean coalgebraic logic can be canonically lifted to define a semantics for its positive fragment, and that weak completeness transfers from the boolean case to the positive case
Non-iterative coherent diffractive imaging using a phase-shifting reference frame
No full textLensless imaging is a high potential and currently intensely targeted research goal, in view of those fields of applications for which aberration-free high-resolution lenses are not available, for example for x-ray imaging. A recently proposed (direct inversion) variant of lensless imaging combines the advantages of two classical routes toward lensless imaging, the high-resolution characteristics of iterative object reconstruction, and the direct and deterministic nature of holographic reconstruction. Here, we use a simple standard optical setup using visible wavelength, a lithographic test object and a phase-shifting reference object to demonstrate the approach. Importantly, we show that a phase-shifting reference object, instead of the absorption mask proposed earlier, is sufficient for object reconstruction. This is relevant in view of the much easier implementation in future x-ray applications
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
The Role of Expectations in Economic Fluctuations and the Efficacy of Monetary Policy
Full text linkWe show diverse beliefs is an important propagation mechanism of fluctuations, money non neutrality and efficacy of monetary policy. Since expectations affect demand, our theory shows economic fluctuations are mostly driven by varying demand not supply shocks. Using a competitive model with flexible prices in which agents hold Rational Belief (see Kurz (1994)) we show that (i) our economy replicates well the empirical record of fluctuations in the U.S. (ii) Under monetary rules without discretion, monetary policy has a strong stabilization effect and an aggressive anti-inflationary policy can reduce inflation volatility to zero. (iii) The statistical Phillips Curve changes substantially with policy instruments and activist policy rules render it vertical. (iv) Although prices are flexible, money shocks result in less than proportional changes in inflation hence the aggregate price level appears “sticky” with respect to money shocks. (v) Discretion in monetary policy adds a random element to policy and increases volatility. The impact of discretion on the efficacy of policy depends upon the structure of market beliefs about future discretionary decisions. We study two rationalizable beliefs. In one case, market beliefs weaken the effect of policy and in the second, beliefs bolster policy outcomes and discretion could be a desirable attribute of the policy rule. Since the central bank does not know any more than the private sector, real social gain from discretion arise only in extraordinary cases. Hence, the weight of the argument leads us to conclude that bank’s policy should be transparent and abandon discretion except for rare and unusual circumstances. (vi) An implication of our model suggests the current effective policy is only mildly activist and aims mostly to target inflation.Monetary policy rules, Money non neutrality, Business cycles, Market volatility, Propagation mechanism, Capacity utilization, Heterogenous beliefs, Over confidence, Rational Belief, Optimism, Pessimism, Non stationarity, Empirical distribution
Große Sportspiele im 5. und 6. Schuljahr
No full textKurz D. Große Sportspiele im 5. und 6. Schuljahr. In: Bober T, Mlodzikowski G, eds. Education physique des enfants avant l'époque de la puberté. Poznan: Varsovie; 1976: 244-248
Die Schwimmfähigkeit der Elfjährigen
No full textKurz D, Fritz T. Die Schwimmfähigkeit der Elfjährigen. Betrifft Sport. 2006;28(6):5-11
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