Sequent Symmetry - définition. Qu'est-ce que Sequent Symmetry
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Qu'est-ce (qui) est Sequent Symmetry - définition

DEFUNCT COMPUTER HARDWARE COMPANY
Sequent Computer Systems Inc.; Sequent Computer Systems, Inc.; Sequent Computer Systems Inc
  • Logo used from 1983 until the mid-1990s
  • Sequent S81 system

Symmetry (physics)         
FEATURE OF A SYSTEM THAT IS PRESERVED UNDER SOME TRANSFORMATION
Internal symmetry; Global symmetry; Isometries in physics; Local symmetry; Internal symmetries; Symmetry in physics; Symmetry transformations
In physics, a symmetry of a physical system is a physical or mathematical feature of the system (observed or intrinsic) that is preserved or remains unchanged under some transformation.
mirror symmetry         
  • A [[normal distribution]] bell curve is an example symmetric function
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  • Many animals, such as this [[spider crab]] ''[[Maja crispata]]'', are bilaterally symmetric.
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  • Mirror symmetry is often used in [[architecture]], as in the facade of [[Santa Maria Novella]], [[Florence]], 1470.
SYMMETRY WITH RESPECT TO A PLANE, WHEN THE SHAPE DOES NOT CHANGE BY REFLECTING ALL OF ITS PART FROM A MIRROR PLANE
Plane of symmetry; Line of symmetry; Mirror Symmetry; Reflectional symmetry; Axes of symmetry; Line symmetry; Reflective symmetry; Reflection symmetries; Mirror symmetric; Linear symmetry; Mirror symmetry
¦ noun symmetry about a plane, like that between an object and its reflection.
Rotational symmetry         
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SYMMETRY (SOMETHING LOOKING THE SAME) UNDER ROTATION
Rotation symmetry; Axisymmetric; Rotational Symmetry; Trilateral symmetry; Rotational symmetric; Rotational symetry; Axisymmetrical; Axisymmetry; Symmetry axis; Rotational symmetries; Rotationally symmetric; Pinwheeling; Rationally symmetrical; Rotationally symmetrical; Discrete rotational symmetry
Rotational symmetry, also known as radial symmetry in geometry, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation.

Wikipédia

Sequent Computer Systems

Sequent Computer Systems was a computer company that designed and manufactured multiprocessing computer systems. They were among the pioneers in high-performance symmetric multiprocessing (SMP) open systems, innovating in both hardware (e.g., cache management and interrupt handling) and software (e.g., read-copy-update).

Through a partnership with Oracle Corporation, Sequent became a dominant high-end UNIX platform in the late 1980s and early 1990s. Later they introduced a next-generation high-end platform for UNIX and Windows NT based on a non-uniform memory access architecture, NUMA-Q. As hardware prices fell in the late 1990s, and Intel shifted their server focus to the Itanium processor family, Sequent joined the Project Monterey effort in October 1998. which aimed to move a standard Unix to several new platforms.

In July 1999 Sequent agreed to be acquired by IBM. At the time, Sequent's CEO said its technology would "find its way through IBM's entire product field" and IBM announced it would "both sell Sequent machines, and fold Sequent's technology...into its own servers", but by May 2002 a decline in sales of the models acquired from Sequent, among other reasons, led to the retirement of Sequent-heritage products.

Vestiges of Sequent's innovations live on in the form of data clustering software from PolyServe (subsequently acquired by HP), various projects within OSDL, IBM contributions to the Linux kernel, and claims in the SCO v. IBM lawsuit.