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tetrad

Definitions

  • WordNet 3.6
    • n tetrad the cardinal number that is the sum of three and one
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Webster's Revised Unabridged Dictionary
    • Tetrad (Chem) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad .
    • Tetrad The number four; a collection of four things; a quaternion.
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Century Dictionary and Cyclopedia
    • n tetrad In cytology, a group of four chromosomes formed by the division of a single chromosome; a quadripartite chromosome.
    • n tetrad The number four; also, a collection of four things. Also quadrad.
    • n tetrad In chem., an atom the equivalence of which is four, or an element one atom of which is equivalent, in saturating power, to four atoms of hydrogen.
    • n tetrad In morphology, a quaternary unit of organization resulting from individuation or integration of an aggregate of triads. See triad, dyad.
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Chambers's Twentieth Century Dictionary
    • n Tetrad tet′rad a group of four:
    • n Tetrad tet′rad (chem.) an atom, radical, or element having a combining power of four
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Etymology

Webster's Revised Unabridged Dictionary
L. tetras, -adis, Gr., : cf. F. tétrade,

Usage

In literature:

How we went down the tetradic steps, and of Panurge's fear.
"Gargantua and Pantagruel, Complete." by Francois Rabelais
How we went down the tetradic steps, and of Panurge's fear.
"Gargantua and Pantagruel, Book V." by Francois Rabelais
Four, or the tetrad, is the most perfect of numbers and the root of all things.
"Three Thousand Years of Mental Healing" by George Barton Cutten
The tetrad for the perfect figure, the cube, length, depth, and width.
"Notes and Queries, Number 77, April 19, 1851" by Various
In figure 130 one lagging chromosome shows the dyad nature of the products of the division of the tetrad.
"Studies in Spermatogenesis (Part 1 of 2)" by Nettie Maria Stevens
During the tetrad division in the basidium nuclear reduction occurs.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3" by Various
Such an axis of symmetry is known as a tetrad axis of symmetry.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various
The widespread, if not universal, formation of tetrads, i.e.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various
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In science:

As a consequence, on curved space-time spinors can be described only with respect to some orthonormal tetrad field.
Quantum Theory within the Framework of General Relativity
The time-like element of the tetrad coincides with the unit tangent vector to the world line.
Quantum Theory within the Framework of General Relativity
The tetrad field along L is obtained by Fermi -Walker transport rather than parallel transport.
Quantum Theory within the Framework of General Relativity
Here we use the tetrad gauge7 that is algebraic and, at the same time, is formulated in an invariant way.
General exact solution of the Einstein-Dirac equations with the cosmological constant in homogeneous space
With the tetrad gauge being used here, all equations are formulated as the first-order equations only for two invariants of the spinor field and Ricci rotation coefficients of the proper bases defined by the spinor field.
General exact solution of the Einstein-Dirac equations with the cosmological constant in homogeneous space
Quite independently Hayashi and Nakano formulated the tetrad theory of gravitation as a gauge theory of the space-time translation group.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
Meyer showed that Møller’s theory is a special case of the Poincar´e gauge theory [8, 9]. S´aez generalized Møller theory into a scalar tetradic theory of gravitation.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
Lorentz transformation of the tetrads λµ leads to a new set of tetrads which also satisfy (1).
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
Wanas obtained a spherically symmetric solutions using the tetrad (14) in the case of +ve definite.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
Mikhail et al. obtained a general solution in Møller’s tetrad theory of gravitation for the tetrad (14) in the vacuum case.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
In this paper we have obtained the general solution of Møller’s tetrad theory of gravitation in case of spherical symmetry and when the stress-energy momentum tensor has a specific form.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
It is of interest to note that in the case of spherical symmetry when the stress-energy momentum tensor is vanishing the general solution does not fix the tetradic geometry too.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
The general solution of a tetrad having spherical symmetry with three unknown functions is obtained.
Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation
The field equations in this new theory were derived from a Lagrangian which is not invariant under local tetrad rotation. S´aez generalized Møller theory into a scalar tetrad theory of gravitation.
General Spherically Symmetric Non Singular Black Hole Solutions in Teleparallel Theory of Gravitation
Mikhail et al. also obtained a spherically symmetric solution of Møller’s theory starting from a tetrad which contains three unknown functions following Mazumder and Ray .
General Spherically Symmetric Non Singular Black Hole Solutions in Teleparallel Theory of Gravitation
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