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The Buchholz hydra game is a hydra game in mathematical logic, a single player game based on the idea of chopping pieces off a mathematical tree. The hydra game can be used to generate a rapidly growing function B H ( n ) {\displaystyle BH(n)} , which eventually dominates all provably total recursive functions.
Buchholz's paper in 1987 showed that the canonical correspondence between a hydra and an infinitary well-founded tree (or the corresponding term in the notation system associated to Buchholz's function, which does not necessarily belong to the ordinal notation system ), preserves fundamental sequences of choosing the rightmost leaves and the operation on an infinitary well-founded tree or the ...
Hydra were observed for four years without any increase in mortality rate. [3] If the mortality rate remains constant, the rate determines the mean lifespan. The lifespan may be long or short, though the species technically does not "age". Individuals of other species have been observed to regress to a larval state and regrow into adults ...
Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are native to the temperate and tropical regions. [2] [3] The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra's heads.
TW Hydrae is a T Tauri star approximately 196 light-years away [1] in the constellation of Hydra (the Sea Serpent).TW Hydrae is about 80% of the mass of the Sun, but is only about 5-10 million years old.
The world record for longest distance run continuously is held by Dean Karnazes, who ran 563 km (350 miles) in 80 hours 44 minutes without stopping. In the absence of significant external factors, non-athletic humans tend to walk at about 1.4 m/s (5.0 km/h; 3.1 mph) and run at about 5.1 m/s (18 km/h; 11 mph).
This is a list of fictional countries from published works of fiction (books, films, television series, games, etc.). Fictional works describe all the countries in the following list as located somewhere on the surface of the Earth as opposed to underground, inside the planet, on another world, or during a different "age" of the planet with a different physical geography.
Earth is a card-based engine-building board game for one to five players. [1] On each turn, players choose one of four actions: planting, composting, watering, or growing. The player making the selection gains resources, then each player can simultaneously use powers of cards on their personal board corresponding to the chosen action