Ribonucleïnezuur (RNA) vervult twee verschillende rollen binnen een cel. Enerzijds heeft het molecuul de functie om informatie op te slaan (net zoals desoxyribonucleïnezuur (DNA)), anderzijds dient het als katalysator (op een manier zoals ook eiwit deze rol vervult). Bovendien kan RNA optreden als katalysator voor zijn eigen reproductie. Het molecuul kan daarom worden beschouwd als een minimaal...

We have already seen that in reasonable situations, i.e. when the path ω-category associated to a higher dimensional automata (HDA) is an ω-groupoid, only the globular nerve satisfies the Kan condition. Indeed for the branching and merging nerves, this condition generally does not hold. This drawback is overcome here by introducing two new nerves (the left and right globular nerves) satisfying ...

Two important research areas in statistical approaches for automated text categorization are similarity-based learning algorithms and associated thresholding strategies. The combination of these techniques significantly influences the overall performance of text categorization systems. After researching common techniques in both areas, we describe a lazy linear classifier known as the keyword a...

1. DERIVED GEOMETRY WITH L∞ ALGEBRAS We are interested in studying formal derived moduli problems, as an orienting remark recall that particularly nice simplicial sets are those that are Kan complexes and that the nerve of a category C is Kan complex if and only if C is a groupoid. Consider the following progression. • Schemes: Functors from commutative algebras to sets; • Stacks: Functors from...

I. INTRODUCTION We humans tend to worry first about our own happiness, then about our families, then about our communities. In times of great stress, such as war or natural disaster, we may focus temporarily on our country but we rarely think about Earth as a whole or the human species as a whole. This narrow perspective, perhaps best exemplified by the American consumer, has led to the environ...

The female and male of Dasybasis (Agelanius) cortesi, new species, is described and illustrated from specimens collected in the National Reserve of Río Clarillo, Cordillera Province, Central Chile. Its relationships to other Dasybasis species are discussed.