منابع مشابه
Hydra
What is Hydra? Hydra is a member of the animal phylum Cnidaria. This phylum includes corals, sea anemones and jellyfish. While most cnidarians are marine, Hydra is unusual in that it lives exclusively in fresh water. Hydra was first described by Antoni van Leeuwenhoek (1632– 1723) in a letter he sent to the Royal Society on Christmas day, 1702. The letter included a red chalk drawing of Hydra o...
متن کاملHydra Groups
We give examples of CAT(0), biautomatic, free–by–cyclic, one–relator groups which have finite–rank free subgroups of huge (Ackermannian) distortion. This leads to elementary examples of groups whose Dehn functions are similarly extravagant. This behaviour originates in manifestations of Hercules–versus–the–hydra battles in string– rewriting. 2010 Mathematics Subject Classification: 20F65, 20F10...
متن کاملGrowth of endosymbiotic algae in the green hydra, Hydra viridissima
Stable endosymbiosis depends upon balanced growth of the symbionts. In green hydra, coincident patterns of host and algal mitotic index suggest that coordinated reproduction provides for balanced growth. However, when hydra shrink during food shortage, the population of endosymbiotic algae in a green hydra must likewise decline in size. Thus far, no mechanism of reducing the size of the endosym...
متن کاملThe Stanford Hydra CMP
0272-1732/00/$10.00 2000 IEEE The Hydra chip multiprocessor (CMP) integrates four MIPS-based processors and their primary caches on a single chip together with a shared secondary cache. A standard CMP offers implementation and performance advantages compared to wide-issue superscalar designs. However, it must be programmed with a more complicated parallel programming model to obtain maximum p...
متن کاملThe Hydra Battle Revisited
Showing termination of the Battle of Hercules and Hydra is a challenge. We present the battle both as a rewrite system and as an arithmetic while program, provide proofs of their termination, and recall why their termination cannot be proved within Peano arithmetic. As a second labour he ordered him to kill the Lernaean hydra. That creature, bred in the swamp of Lerna, used to go forth into the...
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ژورنال
عنوان ژورنال: Magasin fra Det Kongelige Bibliotek
سال: 2015
ISSN: 1904-4348,0905-5533
DOI: 10.7146/mag.v28i1.66813