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Text of the page (random words):
erred basis of r 3 displaystyle mathbb r 3 the affine space description comes from forgetting the origin of the vector space euclidean spaces are sometimes called euclidean affine spaces for distinguishing them from euclidean vector spaces 51 this is physically appealing as it makes the translation invariance of physical space manifest a preferred origin breaks the translational invariance 50 inner product space edit see also inner product space the above discussion does not involve the dot product the dot product is an example of an inner product physical space can be modelled as a vector space which additionally has the structure of an inner product the inner product defines notions of length and angle and therefore in particular the notion of orthogonality 52 for any inner product there exist bases under which the inner product agrees with the dot product citation needed but again there are many different possible bases none of which are preferred they differ from one another by a rotation an element of the group of rotations so 3 in calculus edit main article vector calculus vector calculus is concerned with infinitesimal and cumulative changes to vector fields primarily in three dimensional euclidean space r 3 displaystyle mathbb r 3 for differentiation the del displaystyle nabla or nabla operator is used gradient divergence and curl edit the gradient indicates the direction of greatest increase of a function and its magnitude an example is a flow of particles with the gradient being the magnitude and direction of the flow at a location 53 in a rectangular coordinate system the gradient of a differentiable function f r 3 r displaystyle f mathbb r 3 rightarrow mathbb r is given by 54 f f x i f y j f z k displaystyle nabla f frac partial f partial x mathbf i frac partial f partial y mathbf j frac partial f partial z mathbf k where i j and k are the unit vectors for the x y and z axes respectively in index notation it is written 55 f i i f displaystyle nabla f _ i partial _ i f the divergence indicates the net flux of a vector field around a point such as an increase or decrease of particle density that is whether the location is a source or sink 56 the divergence of a differentiable vector field f u i v j w k that is a function f r 3 r 3 displaystyle mathbf f mathbb r 3 rightarrow mathbb r 3 is equal to the scalar valued function 54 div f f u x v y w z displaystyle operatorname div mathbf f nabla cdot mathbf f frac partial u partial x frac partial v partial y frac partial w partial z in index notation with einstein summation convention this is 55 f i f i displaystyle nabla cdot mathbf f partial _ i f_ i the curl or rotor is a vector indicating the rotational circulation of a vector field expanded in cartesian coordinates see del in cylindrical and spherical coordinates for spherical and cylindrical coordinate representations the curl f is for f composed of f x f y f z 57 i j k x y z f x f y f z displaystyle begin vmatrix mathbf i mathbf j mathbf k frac partial partial x frac partial partial y frac partial partial z f_ x f_ y f_ z end vmatrix this expands as follows 54 curl f f f z y f y z i f x z f z x j f y x f x y k displaystyle operatorname curl mathbf f nabla times mathbf f left frac partial f_ z partial y frac partial f_ y partial z right mathbf i left frac partial f_ x partial z frac partial f_ z partial x right mathbf j left frac partial f_ y partial x frac partial f_ x partial y right mathbf k in index notation with einstein summation convention this is 55 f i ϵ i j k j f k displaystyle nabla times mathbf f _ i epsilon _ ijk partial _ j f_ k where ϵ i j k displaystyle epsilon _ ijk is the totally antisymmetric symbol the levi civita symbol line surface and volume integrals edit illustration of a line integral along curve c in a vector field f a line integral of a function along a curve can be thought of as a continuous summation of the function value along every infinitesimal increment of that curve for some scalar field f u r n r the line integral along a piecewise smooth curve c u is defined as 58 c f d s a b f r t r t d t displaystyle int limits _ c f ds int _ a b f mathbf r t mathbf r t dt where r a b c is an arbitrary bijective one to one correspondence parametrization of the curve c such that r a and r b give the endpoints of c and a b displaystyle a b for a vector field f u r n r n the line integral along a piecewise smooth curve c u in the direction of r is defined as 58 c f r d r a b f r t r t d t displaystyle int limits _ c mathbf f mathbf r cdot d mathbf r int _ a b mathbf f mathbf r t cdot mathbf r t dt where displaystyle cdot is the dot product and r a b c is a bijective parametrization of the curve c such that r a and r b give the endpoints of c a subtype of line integral found in physics is the plane closed loop which determines the circulation of the function around the loop 59 c f r d r displaystyle oint _ c mathbf f mathbf r cdot d mathbf r a surface integral is a generalization of multiple integrals to integration over surfaces it can be thought of as the double integral analog of the line integral to find an explicit formula for the surface integral we need to parameterize the surface of interest s by considering a system of curvilinear coordinates on s like the latitude and longitude on a sphere let such a parameterization be x s t where s t varies in some region t in the plane then the surface integral is given by citation needed s f d s t f x s t x s x t d s d t displaystyle iint _ s f mathrm d s iint _ t f mathbf x s t left partial mathbf x over partial s times partial mathbf x over partial t right mathrm d s mathrm d t where the expression between bars on the right hand side is the magnitude of the cross product of the partial derivatives of x s t and is known as the surface element given a vector field v on s that is a function that assigns to each x in s a vector v x the surface integral can be defined component wise according to the definition of the surface integral of a scalar field the result is a vector a volume integral is an integral over a three dimensional domain or region when the integrand is trivial unity the volume integral is simply the region s volume 60 1 it can also mean a triple integral within a region d in r 3 of a function f x y z displaystyle f x y z and is usually written as d f x y z d x d y d z displaystyle iiint limits _ d f x y z dx dy dz fundamental theorem of line integrals edit main article fundamental theorem of line integrals the fundamental theorem of line integrals says that a line integral through a gradient field can be evaluated by evaluating the original scalar field at the endpoints of the curve 61 let φ u r n r displaystyle varphi u subseteq mathbb r n to mathbb r then φ q φ p γ p q φ r d r displaystyle varphi left mathbf q right varphi left mathbf p right int _ gamma mathbf p mathbf q nabla varphi mathbf r cdot d mathbf r stokes theorem edit main article stokes theorem stokes theorem relates the surface integral of the curl of a vector field f over a surface σ in euclidean three space to the line integral of the vector field over its boundary σ 62 σ f d σ σ f d r displaystyle iint _ sigma nabla times mathbf f cdot mathrm d mathbf sigma oint _ partial sigma mathbf f cdot mathrm d mathbf r divergence theorem edit main article divergence theorem suppose v is a subset of r n displaystyle mathbb r n in the case of n 3 v represents a volume in 3d space which is compact and has a piecewise smooth boundary s also indicated with v s if f is a continuously differentiable vector field defined on a neighborhood of v then the divergence theorem says 63 v f d v displaystyle iiint _ v left mathbf nabla cdot mathbf f right dv s displaystyle scriptstyle s f n d s displaystyle mathbf f cdot mathbf n ds the left side is a volume integral over the volume v the right side is the surface integral over the boundary of the volume v the closed manifold v is quite generally the boundary of v oriented by outward pointing normals and n is the outward pointing unit normal field of the boundary v d s may be used as a shorthand for n ds in topology edit wikipedia s globe logo in 3 d three dimensional space has a number of topological properties that distinguish it from spaces of other dimension numbers for example at least three dimensions are required to tie a knot in a piece of string 64 page needed in differential geometry the generic three dimensional spaces are 3 manifolds which locally resemble r 3 displaystyle mathbb r 3 globally the same 3 manifold can curve in a variety of manners as long as it remains continuous 65 an example of this is the curved spacetime found in general relativity in finite geometry edit many ideas of dimension can be tested with finite geometry the simplest instance is pg 3 2 which has fano planes as its 2 dimensional subspaces 66 it is an instance of galois geometry a study of projective geometry using finite fields thus for any galois field gf q there is a projective space pg 3 q of three dimensions 67 for example any three skew lines in pg 3 q are contained in exactly one regulus 68 see also edit 3d rotation rotation formalisms in three dimensions dimensional analysis distance from a point to a plane four dimensional space skew lines distance three dimensional graph solid geometry terms of orientation references edit 1 2 iec 60050 details for iev number 102 04 39 three dimensional domain international electrotechnical vocabulary in japanese retrieved 2023 09 19 euclidean space encyclopedia of mathematics encyclopediaofmath org retrieved 2020 08 12 details for iev number 113 01 02 space international electrotechnical vocabulary in japanese retrieved 2023 11 07 euclidean space geometry encyclopedia britannica retrieved 2020 08 12 aristotle 350 bc de caelo latin title book 1 translated by stocks j l published in 1922 1 2 artmann benno 2012 euclid the creation of mathematics springer science business media 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