Μετάφραση και ανάλυση λέξεων από την τεχνητή νοημοσύνη ChatGPT
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Τι (ποιος) είναι torus - ορισμός
![A stereographic projection of a [[Clifford torus]] in four dimensions performing a simple rotation through the ''xz''-plane](https://commons.wikimedia.org/wiki/Special:FilePath/Clifford-torus.gif?width=200 "A stereographic projection of a [[Clifford torus]] in four dimensions performing a simple rotation through the ''xz''-plane")
![Seen in [[stereographic projection]], a 4D ''flat torus'' can be projected into 3-dimensions and rotated on a fixed axis.](https://commons.wikimedia.org/wiki/Special:FilePath/Duocylinder ridge animated.gif?width=200 "Seen in [[stereographic projection]], a 4D ''flat torus'' can be projected into 3-dimensions and rotated on a fixed axis.")
![6 × 4 {{=}} 24}} [[quadrilateral]] faces](https://commons.wikimedia.org/wiki/Special:FilePath/Hexagonal torus.png?width=200 "6 × 4 {{=}} 24}} [[quadrilateral]] faces")
.gif?width=200 "Turning a punctured torus inside-out")
![The configuration space of 2 not necessarily distinct points on the circle is the [[orbifold]] quotient of the 2-torus, '''T'''<sup>2</sup>/''S''<sub>2</sub>, which is the [[Möbius strip]].](https://commons.wikimedia.org/wiki/Special:FilePath/Moebius Surface 1 Display Small.png?width=200 "The configuration space of 2 not necessarily distinct points on the circle is the [[orbifold]] quotient of the 2-torus, '''T'''<sup>2</sup>/''S''<sub>2</sub>, which is the [[Möbius strip]].")
![degenerates]] into a double-covered sphere.](https://commons.wikimedia.org/wiki/Special:FilePath/Sphere-like degenerate torus.gif?width=200 "degenerates]] into a double-covered sphere.")
![{4,4}<sub>1,0</sub>]], constructed on the surface of a [[duocylinder]] with 1 vertex, 2 orthogonal edges, and one square face. It is seen here stereographically projected into 3-space as a torus.](https://commons.wikimedia.org/wiki/Special:FilePath/Toroidal monohedron.png?width=200 "{4,4}<sub>1,0</sub>]], constructed on the surface of a [[duocylinder]] with 1 vertex, 2 orthogonal edges, and one square face. It is seen here stereographically projected into 3-space as a torus.")
Βικιπαίδεια
In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle.
If the axis of revolution does not touch the circle, the surface has a ring shape and is called a torus of revolution. If the axis of revolution is tangent to the circle, the surface is a horn torus. If the axis of revolution passes twice through the circle, the surface is a spindle torus. If the axis of revolution passes through the center of the circle, the surface is a degenerate torus, a double-covered sphere. If the revolved curve is not a circle, the surface is called a toroid, as in a square toroid.
Real-world objects that approximate a torus of revolution include swim rings, inner tubes and ringette rings. Eyeglass lenses that combine spherical and cylindrical correction are toric lenses.
A torus should not be confused with a solid torus, which is formed by rotating a disk, rather than a circle, around an axis. A solid torus is a torus plus the volume inside the torus. Real-world objects that approximate a solid torus include O-rings, non-inflatable lifebuoys, ring doughnuts, and bagels.
In topology, a ring torus is homeomorphic to the Cartesian product of two circles: , and the latter is taken to be the definition in that context. It is a compact 2-manifold of genus 1. The ring torus is one way to embed this space into Euclidean space, but another way to do this is the Cartesian product of the embedding of in the plane with itself. This produces a geometric object called the Clifford torus, a surface in 4-space.
In the field of topology, a torus is any topological space that is homeomorphic to a torus. The surface of a coffee cup and a doughnut are both topological tori with genus one.
An example of a torus can be constructed by taking a rectangular strip of flexible material, for example, a rubber sheet, and joining the top edge to the bottom edge, and the left edge to the right edge, without any half-twists (compare Möbius strip).
