Partial derivative: Difference between revisions

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{{hatnote|This article covers advanced topics. For basic topics, see [[Number line]].}}
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{{no footnotes|date=January 2013}}
[[Image:Real number line.svg|thumb|right|350px|The real line]]
 
In [[mathematics]], the '''real line''', or '''real number line''' is the [[line (geometry)|line]] whose [[Point (geometry)|points]] are the [[real number]]s. That is, the real line is the [[set (mathematics)|set]] {{math|'''R'''}} of all real numbers, viewed as a [[geometry|geometric]] [[space (mathematics)|space]], namely the [[Euclidean space]] of [[dimension]] one. It can be thought of as a [[vector space]] (or [[affine space]]), a [[metric space]], a [[topological space]], a [[measure space]], or a [[linear continuum]].
 
Just like the set of real numbers, the real line is usually denoted by the symbol {{math|'''R'''}} (or alternatively, <math> \mathbb{R} </math>, the letter “[[R]]” in [[blackboard bold]]). However, it is sometimes denoted {{math|'''R'''<sup>1</sup>}} in order to emphasize its role as the first Euclidean space.
 
This article focuses on the aspects of {{math|'''R'''}} as a geometric space in [[topology]], geometry, and [[real analysis]].  The real numbers also play an important role in [[algebra]] as a [[field (mathematics)|field]], but in this context {{math|'''R'''}} is rarely referred to as a line. For more information on {{math|'''R'''}} in all of its guises, see [[real number]].
 
==As a linear continuum==
The real line is a [[linear continuum]] under the standard {{math|<}} ordering.  Specifically, the real line is [[linearly ordered set|linearly ordered]] by {{math|<}}, and this ordering is [[dense order|dense]] and has the [[least-upper-bound property]].
 
In addition to the above properties, the real line has no [[Greatest element|maximum]] or [[least element|minimum element]]. It also has a [[countable set|countable]] [[dense set|dense]] [[subset]], namely the set of [[rational number]]s.  It is a theorem that any linear continuum with a countable dense subset and no maximum or minimum element is [[Order isomorphism|order-isomorphic]] to the real line.
 
The real line also satisfies the [[countable chain condition]]: every collection of mutually [[disjoint sets|disjoint]], [[nonempty]] open [[interval (mathematics)|interval]]s in {{math|'''R'''}} is countable. In [[order theory]], the famous [[Suslin's problem|Suslin problem]] asks whether every linear continuum satisfying the countable chain condition that has no maximum or minimum element is necessarily order-isomorphic to {{math|'''R'''}}.  This statement has been shown to be [[independence (mathematical logic)|independent]] of the standard axiomatic system of [[set theory]] known as [[ZFC]].
 
==As a metric space==
[[File:Absolute difference.svg|thumb|300px|right|The [[metric space|metric]] on the real line is [[absolute difference]].]]
The real line forms a [[metric space]], with the [[distance function]] given by absolute difference:
:{{math|''d''(''x'', ''y'')  {{=}}  {{!}} ''x'' − ''y'' {{!}} }}.
The [[metric tensor]] is clearly the 1-dimensional [[Euclidean metric]]. Since the'' {{math|n}}''-dimensional Euclidean metric can be represented in matrix form as the ''{{math|n}} ''by '' {{math|n}}'' identity matrix, the metric on the real line is simply the 1 by 1 identity matrix, i.e. 1.
 
If {{math|''p'' ∈ '''R'''}} and {{math|''ε'' > 0}}, then the {{math|''ε''}}-[[Ball (mathematics)|ball]] in {{math|'''R'''}} centered at {{math|''p''}} is simply the open [[Interval (mathematics)|interval]] {{math|(''p'' − ''ε'', ''p'' + ''ε'')}}.
 
This real line has several important properties as a metric space:
* The real line is a [[complete metric space]], in the sense that any [[Cauchy sequence]] of points converges.
* The real line is [[path-connected]], and is one of the simplest examples of a [[geodesic metric space]]
* The [[Hausdorff dimension]] of the real line is equal to one.
 
==As a topological space==
[[Image:Real projective line.svg|right|thumb|150px|The real line can be [[Compactification (mathematics)|compactified]] by adding a  [[point at infinity]].]]
The real line carries a standard [[topological space|topology]] which can be introduced in two different, equivalent ways.
First, since the real numbers are [[total order|totally ordered]], they carry an [[order topology]].  Second, the real numbers inherit a [[metric topology]] from the metric defined above.  The order topology and metric topology on {{math|'''R'''}} are the same. As a topological space, the real line is [[homeomorphism|homeomorphic]] to the open interval {{math|(0, 1)}}.
 
The real line is trivially a [[topological manifold]] of [[dimension]] {{Num|1}}.  Up to homeomorphism, it is one of only two different 1-manifolds without [[manifold with boundary|boundary]], the other being the [[circle]].  It also has a standard differentiable structure on it, making it a [[differentiable manifold]]. (Up to [[diffeomorphism]], there is only one differentiable structure that the topological space supports.)
 
The real line is [[locally compact]] and [[paracompact]], as well as [[second-countable space|second-countable]] and [[normal space|normal]].  It is also [[path-connected]], and is therefore [[connected space|connected]] as well, though it can be disconnected by removing any one point.  The real line is also [[contractible]], and as such all of its [[homotopy group]]s and [[reduced homology]] groups are zero.
 
As a [[locally compact space]], the real line can be compactified in several different ways.  The [[one-point compactification]] of {{math|'''R'''}} is a circle (namely the [[real projective line]]), and the extra point can be thought of as an unsigned infinity.  Alternatively, the real line has two [[End (topology)|ends]], and the resulting end compactification is the [[Extended real number line|extended real line]] {{math|[−∞, +∞]}}.  There is also the [[Stone–Čech compactification]] of the real line, which involves adding an infinite number of additional points.
 
In some contexts, it is helpful to place other topologies on the set of real numbers, such as the [[lower limit topology]] or the [[Zariski topology]]. For the real numbers, the latter is the same as the [[finite complement topology]].
 
==As a vector space==
The real line is a [[vector space]] over the [[field (mathematics)|field]] {{math|'''R'''}} of real numbers (that is, over itself) of [[dimension]] {{Num|1}}. It has a standard [[inner product]], making it a [[Euclidean space]]. (The inner product is simply ordinary [[multiplication]] of real numbers.)  The standard [[Norm (mathematics)|norm]] on {{math|'''R'''}} is simply the [[absolute value]] function.
 
==As a measure space==
The real line carries a canonical [[Measure (mathematics)|measure]], namely the [[Lebesgue measure]].  This measure can be defined as the [[Complete measure|completion]] of a [[Borel measure]] defined on {{math|'''R'''}}, where the measure of any interval is the length of the interval.
 
Lebesgue measure on the real line is one of the simplest examples of a [[Haar measure]] on a [[locally compact group]].
 
==In real algebras==
The real line is a one-dimensional [[subspace (linear algebra)|subspace]] of a [[algebra over a field|real algebra]] ''A'' where '''R''' ⊂ ''A''. For example, in the [[complex plane]] ''z'' = ''x'' + i''y'', the subspace {''z'' : ''y'' = 0} is a real line. Similarly, the algebra of [[quaternion]]s
:''q'' = ''w'' + ''x'' i + ''y'' j + ''z'' k
has a real line in the subspace {''q'' : ''x'' = ''y'' = ''z'' = 0 }.
 
When the real algebra is a [[direct sum of modules|direct sum]] <math>A = R \oplus V,</math> then a '''conjugation''' on ''A'' is introduced by the mapping <math>v \mapsto  -v</math>  of subspace ''V''. In this way the real line consists of the [[fixed point (mathematics)|fixed point]]s of the conjugation.
 
==See also==
* [[Line (geometry)]]
* [[Imaginary line (mathematics)]]
* [[Real projective line]]
 
==References==
* {{cite book
| first = James
| last = Munkres
| author-link = James Munkres
| year = 1999
| title = Topology
| edition = 2nd
| publisher = [[Prentice Hall]]
| isbn = 0-13-181629-2
}}
* Walter Rudin, ''Real and Complex Analysis'', McGraw-Hill, 1966, ISBN 0-07-100276-6.
 
{{DEFAULTSORT:Real Line}}
[[Category:Real numbers]]
[[Category:Topological spaces]]
 
[[es:Recta real]]
[[eu:Zuzen erreal]]

Revision as of 15:56, 1 March 2014

Include polyunsaturated fats such as sunflower oil and corn oil along with omega three fatty acids like salmon, soybean oil, and herring. Cochise County's seat, the once-boomed and now busted town of Bisbee[1] has spent the past two decades reinventing itself as an artist community and weekend destination. What is important is to maintain a balanced diet at all times. Coming up with your own poems for toddlers are a great way to add your touch to any holiday or classroom themed lesson plan. Another thing you will learn from the Grow Taller For Idiots product are tips to improve posture.

Moreover, swimming also adds in your efforts on how to increase height naturally. The reason this happens is because in the spine the vertebrae discs are made of stretchable cartilage materiel, and as you go through the day gravity forces the spinal column to compress, causing you to lose a little height. Unique experts who manage issues say for instance a specific inquiring themselves How Can I Get Taller. In understanding the genetics of Mosaic Turner syndrome, we know it is usually caused by nondisjunction. So, in order to increase your height after puberty, you must work on the bones in your spine.

If I had started playing Call of Duty 5: World at War and Call of Duty 4: Modern Warfare at the same time, I would have spent a lot more time in Co - D4 than Co - D5. During this process of getting taller, at least 8 hours of sleep is important. It should take approximately five to ten minutes to conduct both. In fact, these methods do not have any side effects on you. In summary, there are numerous ways of growing taller even after the stipulated age.

The research has additionally suggested the truth that the average height is just about 1. It is also terribly necessary to adopt grow taller exercises which target the components of your body that have the potential to grow. However, there are also some types of foods, injections, drinks and pills that also contain the hormone. Usually, after puberty the bones in legs get fused, but the bones in spine are not fused. The rest will never reach this standard, but should strive to achieve it.

You must learn how to hold your head, your pelvis, your legs, sit correctly; walk correctly, plus numerous other do's and don'ts to assure you of achieving every possible inch of height. In an interview with the British Broadcasting Corporation (BBC) at the time of the discovery, researcher Dr Tim Frayling of the Peninsula Medical School in Exeter expressed the widely held belief that more genes will be revealed. HGH causes us to grow taller and develop into our adult bodies. Big Tex's clothing, a set of denim jeans and red-white-and blue cowboy shirt, contributed to the fast-burning blaze. The pictures of female bodies are seen being displayed all over the place.

If you enjoyed this information and you would like to get additional facts regarding how to grow taller for idiots (see page) kindly visit our own internet site.