Play (Joanna MacGregor album)
Play is a 2002 album by Joanna MacGregor. The album was released on the SoundCircus label and was a nominee for the Mercury Music Prize.
References
Play (Robyn song)
"Play" is a song by Swedish recording artist Robyn from her second studio album My Truth (1999). Robyn wrote the track in collaboration with Ulf Lindström and Johan Ekhé, who also helmed production. BMG Sweden released it as the album's second single on 21 July 1999 with the non-album song "Good Thang" as its B-side. Musically, "Play" contains some world music influences and a "playful" vibe.
"Play" received positive critical response and became Robyn's seventh consecutive top 40 entry on the Sverigetopplistan singles chart, where it peaked at number 31. The singer performed the song live while promoting the parent album, but the single itself received limited promotion. As with the album, "Play" was not serviced outside of Sweden.
Background and composition
"Play" was written by Robyn, Ulf Lindström and Johan Ekhé. Lindström and Ekhé recorded Robyn's vocals and produced the track at Lifeline Studios in Stockholm, Sweden. Almnils Erson, Pär-Ola Claesson, Gunilla Markström and Olle Markström played the strings and Niklas Gabrielsson provided handclaps, while Lindström and Ekhé played all other instruments. The duo also managed arrangement and mixing; both these tasks were done at Lifeline Studios. Britta Bergström and Angela Holland sang backing vocals alongside Robyn. Björn Engelmann and Henrik Jonsson were enlisted to master the track at Cutting Room Studios in Stockholm.
Play (telecommunications)
Play, P4 is a brand name of the fourth Polish cellular telecommunications provider.
Icelandic-led Novator acquired a large stake in the company.
Network
Play is the third biggest cellular network in Poland. PLAY uses EGSM 900 and GSM1800 for its 2G services, UMTS 2100 and UMTS 900 for 3G and LTE1800 and LTE2100 for LTE. Its MCC is 260-06. Thanks to domestic roaming with Polkomtel (Plus) and Centertel (Orange), Play is a nationwide cellular carrier.
Native Network
As of November 3, 2013, Play Mobile has 3288 EGSM 900 BTS, 4143 UMTS 2100 nodeB and 2175 UMTS 900 nodeB's. UMTS 900 and UMTS 2100 network Play calls the 4G network. Currently 82% of population is covered with Play's native 4G network and 40% of population with 2G network. 4G is available in more than 300 cities and towns around Poland. Play started building its 3G network at the beginning of its existence (2007) and announced that its goal is to cover all of Poland with UMTS while provide GSM services through roaming. Play began building its GSM network in March 2009 in apparent bid to reduce roaming costs. EGSM 900 BTS and UMTS 900 nodeB use the same licence frequency. In place when are EGSM 900 usually is not UMTS 900. Play Mobile Broadband (Play Online) products does not used 2G network.
Lucien Juy
Lucien Charles Hippolyte Juy was a French industrialist who made derailleur gears. He is credited with making the first derailleur with a collapsible parallelogram. A hinged frame swung in and out from the frame and fed the chain to one of a number of sprockets attached to the hub. Juy's derailleurs, sold as Simplex derailleurs, were novel in having a jockey wheel to correct the tension of the chain as it moved across differently sized sprockets.
History
Lucien Juy owned a bicycle shop in Dijon, Côte d'Or, France. It was there that he made the first Simplex derailleur in 1928. The bicycle historian Hilary Stone said: "It used a single pulley to tension the chain and a pair of guide plates to push the chain to each one of two sprockets. The whole arm was spring-loaded in order to tension the chain – this was the first use of the sprung top pivot which was to become an essential part of the modern indexed derailleur as we know it today. The pulley and guide plates were moved sideways on a push-rod by means of a chain pulling through the centre of the push-rod. Lucien Juy managed to persuade the management of the Alcyon racing team to fit his Le Simplex gear to their machines for the 1928 Paris–Roubaix – unfortunately the riders revolted and refused to use the new unproven gears."
7-simplex
In 7-dimensional geometry, a 7-simplex is a self-dual regular 7-polytope. It has 8 vertices, 28 edges, 56 triangle faces, 70 tetrahedral cells, 56 5-cell 5-faces, 28 5-simplex 6-faces, and 8 6-simplex 7-faces. Its dihedral angle is cos−1(1/7), or approximately 81.79°.
Alternate names
It can also be called an octaexon, or octa-7-tope, as an 8-facetted polytope in 7-dimensions. The name octaexon is derived from octa for eight facets in Greek and -ex for having six-dimensional facets, and -on. Jonathan Bowers gives an octaexon the acronym oca.
Coordinates
The Cartesian coordinates of the vertices of an origin-centered regular octaexon having edge length 2 are:
More simply, the vertices of the 7-simplex can be positioned in 8-space as permutations of (0,0,0,0,0,0,0,1). This construction is based on facets of the 8-orthoplex.
Images
Related polytopes
This polytope is a facet in the uniform tessellation 331 with Coxeter-Dynkin diagram:
This polytope is one of 71 uniform 7-polytopes with A7 symmetry.
Tetrahedron
In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons) is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the ordinary convex polyhedra and the only one that has fewer than 5 faces.
The tetrahedron is the three-dimensional case of the more general concept of a Euclidean simplex.
The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point. In the case of a tetrahedron the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid".
Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper. It has two such nets.
For any tetrahedron there exists a sphere (called the circumsphere) on which all four vertices lie, and another sphere (the insphere) tangent to the tetrahedron's faces.
Regular tetrahedron
A regular tetrahedron is one in which all four faces are equilateral triangles. It is one of the five regular Platonic solids, which have been known since antiquity.
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