An l-ruler is a chain of n links, each of length l. The links, which are allowed to cross, are modelled by line segments whose endpoints act as joints. A given connguration of an l-ruler is said to fold if it can be moved to a connguration in which all its links coincide. We show that l-rulers connned inside an equilateral triangle of side 1 exhibit the following surprising alternation property...

Old wargames never die, but many fade away. Sometimes, though an old classic gets the chance to regain its youthful vigor after mellowing on the shelf for a few years with a revision of its rules, or a full scale new edition. Decline and Fall of the Third Reich, by Avalon Hill, stands among the chosen few with the newly released 1981 Revised Update Kit. Benefiting from six years of trials and e...

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This paper serves as a companion or extension to the “Inside PageRank” paper by Bianchini et al. [Bianchini et al. 03]. It is a comprehensive survey of all issues associated with PageRank, covering the basic PageRank model, available and recommended solution methods, storage issues, existence, uniqueness, and convergence properties, possible alterations to the basic model, suggested alternative...

Her parents, therapists, nutritionists and teachers had spent years preparing the way. They had moved mountain to improve her sense of balance, her sensory perception and her overall health. They sent in truckloads of occupational and physical therapy and emotional support. But it wasn't until the fall of 2005 that traffic finally began to flow in the other direction. Hannah, whose speech was l...

Morphological segmentation has traditionally been modeled with non-hierarchical models, which yield flat segmentations as output. In many cases, however, proper morphological analysis requires hierarchical structure— especially in the case of derivational morphology. In this work, we introduce a discriminative joint model of morphological segmentation along with the orthographic changes that oc...

We consider a model of liquidity demand arising from a possible maturity mismatch between asset revenues and consumption. This liquidity demand can be met with either cash reserves (inside liquidity) or via asset sales for cash (outside liquidity). The question we address is, what determines the mix of inside and outside liquidity in equilibrium? An important source of inefficiency in our model...

We consider a model of liquidity demand arising from a possible maturity mismatch between asset revenues and consumption. This liquidity demand can be met with either cash reserves (inside liquidity) or via asset sales for cash (outside liquidity). The questions we address are: (a) what determines the mix of inside and outside liquidity in equilibrium? (b) does the market provide an efficient m...

Synthetic hosts capable of binding porphyrins have been produced by a mixed-covalent-noncovalent imprinting process wherein a single binding site is created within cross-linked dendrimers. Two synthetic hosts were prepared, using as templates 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin and 5,10,15,20-tetrakis(3,5-dihydroxyphenyl)porphyrin. These two templates were esterified with, respectivel...