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In fixed retainers, composite is usually placed to bond and to cover the wire, whilst ensuring no interference in the interdental space. Fixed retainers are used in situations where instability is more likely, such as severe rotations, periodontal disease and median diastemas. Occasionally the patient will require a removable retainer as well.
The dentist or dental auxiliary use dental mirrors to view a mirror image of the teeth in locations of the mouth where visibility is difficult or impossible. They also are used for reflecting light onto desired surfaces, and for retraction of soft tissues to improve access or vision.
A matrix equation of the form = is called a Toeplitz system if is a Toeplitz matrix. If is an Toeplitz matrix, then the system has at most only unique values, rather than . We might therefore expect that the solution of a Toeplitz system would be easier, and indeed that is the case.
Another universal gate, the Deutsch gate, can be realized by five optical pulses with neutral atoms. [7] The Deutsch gate is a universal gate for quantum computing. [8] The Margolus gate (named after Norman Margolus), also called simplified Toffoli, is very similar to a Toffoli gate but with a −1 in the diagonal: RCCX = diag(1, 1, 1, 1, 1 ...
An circulant matrix takes the form = [] or the transpose of this form (by choice of notation). If each c i {\displaystyle c_{i}} is a p × p {\displaystyle p\times p} square matrix , then the n p × n p {\displaystyle np\times np} matrix C {\displaystyle C} is called a block-circulant matrix .
In linear algebra, an invertible complex square matrix U is unitary if its matrix inverse U −1 equals its conjugate transpose U *, that is, if = =, where I is the identity matrix.. In physics, especially in quantum mechanics, the conjugate transpose is referred to as the Hermitian adjoint of a matrix and is denoted by a dagger ( † ), so the equation above is written
A dappen glass (also called Dappen Dish) is a small, dense glass or ceramic vessel which has each end ground or hollowed out to provide a bowl for mixing substances. . Generally these dishes have ten equal walls with a large bowl on one side and a smaller bowl ground out on
The universal property means that any ring homomorphism from , …, to a matrix ring factors through .This has a following geometric meaning. In algebraic geometry, the polynomial ring [, …,] is the coordinate ring of the affine space , and to give a point of is to give a ring homomorphism (evaluation) [, …,] (either by Hilbert's Nullstellensatz or by the scheme theory).
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