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In questa pagina puoi ottenere un'analisi dettagliata di una parola o frase, prodotta utilizzando la migliore tecnologia di intelligenza artificiale fino ad oggi:
- come viene usata la parola
- frequenza di utilizzo
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- opzioni di traduzione delle parole
- esempi di utilizzo (varie frasi con traduzione)
- etimologia
Cosa (chi) è keel-block - definizione
STRUCTURAL ELEMENT OF A SHIP HULL, OR BOAT HULL
Keel yacht; Keel plate; Ship’s keel; Swing keel
 being laid in a construction dry dock on 18 April 1948.jpg?width=200)
![Sailing [[yacht]] with a fin keel](https://commons.wikimedia.org/wiki/Special:FilePath/MariahQuarterView.jpg?width=200 "Sailing [[yacht]] with a fin keel")
Block (permutation group theory)
TERM IN MATHEMATICS AND GROUP THEORY
Block system
In mathematics and group theory, a block system for the action of a group G on a set X is a partition of X that is G-invariant. In terms of the associated equivalence relation on X, G-invariance means that
block system
TERM IN MATHEMATICS AND GROUP THEORY
Block system
¦ noun a system of railway signalling which divides the track into sections and allows no train to enter a section that is not completely clear.
Block system
TERM IN MATHEMATICS AND GROUP THEORY
Block system
·add. ·- A system by which the track is divided into short sections, as of three or four miles, and trains are so run by the guidance of electric, or combined electric and pneumatic, signals that no train enters a section or block until the preceding train has left it, as in absolute blocking, or that a train may be allowed to follow another into a block as long as it proceeds with excessive caution, as in permissive blocking.
Wikipedia
Keel
 being laid in a construction dry dock on 18 April 1948.jpg?width=120)
The keel is the bottom-most longitudinal structural element on a vessel. On some sailboats, it may have a hydrodynamic and counterbalancing purpose, as well. The laying of the keel is often the initial step in the construction of a ship. In the British and American shipbuilding traditions, this event marks the beginning date of a ship's construction.
