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# Topic: Simultaneity

###### In the News (Fri 17 May 13)

 NationMaster - Encyclopedia: Simultaneity In mathematics, a system of equations or a set of simultaneous equations share variables; a solution is a set of variable values for which all these equations are satisfied simultaneously. Simultaneity is a more general term than chord: most chord progressions or harmonic progressions are then simultaneity successions, though not all simultaneity successions are harmonic progressions and not all simultaneities are chords. Concurrence or Simultaneity is a legal term, from Western jurisprudence, referring to the simultaneous occurrence of actus reus (bad action) and mens rea (bad mind), which must be present for a crime to have occurred; except in crimes of strict liability. www.nationmaster.com /encyclopedia/Simultaneity   (977 words)

 Whitehead, Special Relativity and Simultaneity Note that this establishes the clock simultaneity of events distant from the observer, though the same determination of clock simultaneity of distant events with events of the observer’s world-line may be deduced from the description as outlined by Whitehead (PNK 51f.). The simultaneity of the whole of nature comprising the discerned events is the special relation of that background of nature to the percipient event, which is itself part of the whole. Hence simultaneity for Whitehead is the spatial spread of events in a given inertial frame as defined by a given duration, and is Newtonian in the sense that each instantaneous space in a frame provides a single present class of all events in nature relative to that frame. www.religion-online.org /showarticle.asp?title=2552   (5185 words)

 Simultaneity   (Site not responding. Last check: 2007-10-19) Simultaneity is the property of two events happening at the same time. In mathematics, a system of equations or a set of simultaneous equations share variables; a solution is a set of variable values for which all these equations are satisfied simultaneously. Simultaneity is a more general term than chord: most chord progressions or harmonic progressions are then simultaneity successions, though not all simultaneity successions are harmonic progressions and not all simultaneities are chords. www.bidprobe.com /en/wikipedia/s/si/simultaneity.html   (149 words)

 Chapter 9. The Relativity of Simultaneity. Einstein, Albert. 1920. Relativity: The Special and General Theory When we say that the lightning strokes A and B are simultaneous with respect to the embankment, we mean: the rays of light emitted at the places A and B, where the lightning occurs, meet each other at the mid-point M of the length A —> B of the embankment. Events which are simultaneous with reference to the embankment are not simultaneous with respect to the train, and vice versa (relativity of simultaneity). But we have just seen that this assumption is incompatible with the most natural definition of simultaneity; if we discard this assumption, then the conflict between the law of the propagation of light in vacuo and the principle of relativity (developed in Section VII) disappears. www.bartleby.com /173/9.html   (745 words)

 Simultaneity in Special Relativity Most of the apparent paradoxes of special relativity arise because observers moving at different velocities relative to each other have different notions of simultaneity. Cerulean's hypersurfaces of simultaneity are not the same as Vermilion's. Thus for Cerulean, as for Vermilion, the speed of light is constant, the same in all directions. casa.colorado.edu /~ajsh/sr/simultaneous.html   (451 words)

 Simultaneity succession - Wikipedia, the free encyclopedia In music and music theory a simultaneity succession a series of different groups of pitches or pitch classes, each of which is played at the same as the other pitches of its group. Thus, a simultaneity succession is a succession of simultaneities. Simultaneity succession is a more general term than chord progression or harmonic progression: not all simultaneity successions are harmonic progressions but most chord progressions are simultaneity successions. en.wikipedia.org /wiki/Simultaneity_succession   (95 words)

 Simultaneity - Wikipedia, the free encyclopedia Simultaneity is the property of two events happening at the same time in at least ONE Reference frame. In criminal law, for a criminal violation to be established, it be shown that there was simultaneity of actus reus and mens rea. A pitch simultaneity is also more than one pitch or pitch class all of which occur at the same time, or simultaneously. en.wikipedia.org /wiki/Simultaneity   (265 words)

 EL's Simultaneity   (Site not responding. Last check: 2007-10-19) It was my feeling that since simultaneity cannot be shown to a perfect degree due to the relationship between space and time, I felt this may make the discussion of a "universal now" to be suspicious, not only in the sense of human perception, but also physics and reality itself (whatever that is). It is obvious that events must happen simultaneously (concurrently) or else all the, say, particles of the universe would have take turns, and that would be silly, not to mention slow. Simultaneity is not about event-points coinciding or world-lines intersecting, it is about the fact that continuous motion of independent entities must be concurrent. www.thehelparchive.com /new-1542946-290.html   (2532 words)

 Simultaneity - Encyclopedia.WorldSearch   (Site not responding. Last check: 2007-10-19) Duration and Simultaneity: Bergson and the Einsteinian Universe Simultaneity of value and non-cash expenses in small business valuation. Simultaneity in the use of maternal-child health care and contraceptives: Evidence from developing countries : An article from: Demography encyclopedia.worldsearch.com /simultaneity.htm   (341 words)

 The Breakdown of Simultaneity Of course, the greater the distance between objects, the greater the change in velocity (and simultaneity relations) during the performance of a synchronization procedure. The worldline of a particular point on the rim is shown by the helical curve AB, and the shallower helix represents the analytically continued surface of inertial simultaneity. The usual intuitive definition of the spatial length of an object (such as the perimeter of the rim) is the absolute length of a locus of inertially simultaneous points of that object, so it depends on the establishment of a slice of "inertial simultaneity" over the entire rim. www.mathpages.com /rr/s4-08/4-08.htm   (1684 words)

 The simultaneity, the conservation and the permanence   (Site not responding. Last check: 2007-10-19) The Simultaneity and the Conservation are notions of the Permanence of the universe. The Simultaneity is a phenomenon of the Permanence of the Whole. Owing to the Simultaneity rule, it is allowed for each, everywhere where he is located, to be insured to use a same volume (same quantity), provided that it has an equivalent volume. www.dakhi.com /dk001en.htm   (4230 words)

 The Old New Thing : Even in computing, simultaneity is relative   (Site not responding. Last check: 2007-10-19) Since simultaneity is relative, any code that does X and Y simultaneously can be observed to have performed X before Y or Y before X, depending on your frame of reference. Simultaneity for things moving near light speed is a relative concept due to the use of reference frame. Simultaneity of execution of instructions on a single CPU is of course impossible because of sequence principle. blogs.msdn.com /oldnewthing/archive/2004/09/03/225238.aspx   (2783 words)

 Journal of Vision - Recalibration of audiovisual simultaneity by adaptation to a constant time lag, by Fujisaki, ...   (Site not responding. Last check: 2007-10-19) To find simultaneity between visual and audio events is a challenging problem for our sensory system since there are differences in both physical transmission time and neural processing time. One strategy the brain might take to overcome this difficulty is to adaptively recalibrate the point of simultaneity from daily experience of audiovisual events, rather than using a fixed neural circuit, as has been generally believed. The results indicate that the adaptation to an audiovisual lag shifted the point of subjective simultaneity in the direction to the adapted lag. www.journalofvision.org /3/9/34   (387 words)

 The Breakdown of Simultaneity Of course, the greater the distance between objects, the greater the change in velocity (and simultaneity relations) during the performance of a synchronization procedure. The worldline of a particular point on the rim is shown by the helical curve AB, and the shallower helix represents the analytically continued surface of inertial simultaneity. The usual intuitive definition of the spatial length of an object (such as the perimeter of the rim) is the absolute length of a locus of inertially simultaneous points of that object, so it depends on the establishment of a slice of "inertial simultaneity" over the entire rim. mathpages.com /rr/s4-08/4-08.htm   (1684 words)

 Simultaneity The result is that we hear many points simultaneously, so for example, if we have simultaneous recordings of a street, we hear cars, people, birds etc, moving around the circle of speakers at different speeds. A large scale version of Simultaneity is being created for the 60th anniversary of the United Nations this year - it is intended to tour globally for 10 years, returning to New York for the 70th anniversary in 2015. The first Simultaneity recording was made in New York City, with the help of Caryn Havlik and a team of volunteers from WNYC radio (see below) on a freezing saturday in November 2004. www.pmwmusic.com /simultaneity.html   (233 words)

 ABSOLUTE SIMULTANEITY AND THE INFINITY OF TIME We thus require a definition of simultaneity such that this definition supplies us with the method by means of which, in the present case [where two lightning strokes hit near the front and back of a train], he can decide by experiment whether or not both the lightning strokes occurred simultaneously. My argument for absolute simultaneity and the infinity of past and future time hinges on the admittedly controversial assumption that there are some abstract objects whose existence is not dependent on the existence of any concrete object. My memory image exists simultaneously with my occurrent mental act of remembering, but the relation of remembering (by definition) is a relation to some thing or event that exists earlier than the act of remembering. www.qsmithwmu.com /absolute_simultaneity_and_the_infinity_of_time.htm   (11694 words)

 [No title]   (Site not responding. Last check: 2007-10-19) Einstein's 1916 popular exposition of relativity favours a misunderstanding of the simultaneity criticism. On the contrary, the uncertainty is a consequence of the wave-particle dualism and it is not possible to interpret it in perturbative terms, but only presupposing quantum theory in general. Like simultaneity, uncertainty is a physical issue and not an epistemological analysis. www.phys.uu.nl /~wwwgrnsl/abstracts/fano020604.html   (107 words)

 Symposium: Simultaneity and gender in the 'Premier Livre Simultane.' (Blaise Cendrars, Sonia Delaunay)@ HighBeam ... Themes of gender and simultaneity predominate in the 'Premiere Livre Simultane,' a joint project of the poet Blaise Cendrars and the painter Sonia Delaunay. The text of the work is a poem by Cendrars, 'La Prose du Transsiberien et de la petite Jehanne de France.' Cendrars attempts to unite his masculine and feminine aspects to create an androgynous text. In addition, simultaneity is represented in the poem's style and circular structure, as well as in the simultaneity of past, present and future. www.highbeam.com /library/doc0.asp?DOCID=1G1:20124878&refid=ip_encyclopedia_hf   (196 words)

 Why Stories Work | Simultaneity   (Site not responding. Last check: 2007-10-19) Simultaneous events are a lot like oysters piled on a beach, waiting for a writer to separate what's relevant and string the important treasures together in logical progression. That said, there are times when simultaneity is perfectly logical in narrative description. Simultaneity breaks the cause-and-effect pattern that connects readers with the feelings on the page. www.svic.net /pearl/simultaneity.html   (596 words)

 simultaneity   (Site not responding. Last check: 2007-10-19) "Simultaneity" is not an absolute concept but a relative one, depending on the state of motion of the observer. Such is the case for most experiences of daily living and this is why the relativity of simultaneity is unfamiliar. Conclusion: Simultaneity (the idea that two events are simultaneous) is a concept that depends upon the motion of the observer. patsy.hunter.cuny.edu /CORE/CORE4/LectureNotes/relativity/relativity3.htm   (486 words)

 sciforums.com - The Simultaneity postulate of SR/GR is Erroneous When discussing the physical significance of simultaneity, the description is inextricably linked to “the observers conclusions”; This simple example stresses the rejection of the natural order of things by the definitive assumption that the observer always makes the proper assumptions about the extent of the analysis of experimental results. If he knew that the lights were turned on simultaneously by two moving observers just as O' passedn through the midpoint then and assume he knows that moving light switches turned on the sources at the same time in his frame at the instant he was at the midpoint. The relativity of simultaneity is not a postulate of the theory of relativity. www.sciforums.com /showthread.php?t=36118   (7695 words)

 Conventionality of Simultaneity It might be argued that the definition of standard synchrony makes use only of the relation of equality (of the one-way speeds of light in different directions), so that simplicity dictates its choice rather than a choice that requires the specification of a particular value for a parameter. Dropping that requirement, they show that Malament's other criteria for a simultaneity relation are then also satisfied if we fix some arbitrary event in space-time and say either that any pair of events on its backward null cone are simultaneous or, alternatively, that any pair of events on its forward null cone are simultaneous. Giulini (2001, p.653) argues that it is too strong a requirement to ask that a simultaneity relation be invariant under causal transformations (such as scale transformations) that are not physical symmetries, which Malament as well as Sarkar and Stachel do. www.science.uva.nl /~seop/archives/win2003/entries/spacetime-convensimul   (3317 words)

 Simultaneity and Absolute Velocity of Light This is known as Einstein's principle of relativity of simultaneity. Therefore when he writes that two events are simultaneous in two different frames, he means that they occur at the moment when the clocks of observers in both frames show the same display. Instead of saying that two events simultaneous in one frame are not simultaneous in another, he should have said that there is no identity of clock displays between clocks in different frames. www.newtonphysics.on.ca /EINSTEIN/Chapter9.html   (2082 words)

 Conventionality of Simultaneity In his first paper on the special theory of relativity, Einstein indicated that the question of whether or not two spatially separated events were simultaneous did not necessarily have a definite answer, but instead depended on the adoption of a convention for its resolution. It would seem that this transport scheme is sufficiently similar to the slow-transport scheme that it could engender much the same debate, apart from those aspects of the debate that focussed specifically on the issue of slowness. They show further that, among the relations satisfying these requirements, standard synchrony is the unique such relation that is independent of the position of an observer and the half-null-cone relations are the unique such relations that are independent of the motion of an observer. plato.stanford.edu /entries/spacetime-convensimul   (3318 words)

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