LaTeX to CAS translator

This mockup demonstrates the concept of TeX to Computer Algebra System (CAS) conversion.

The demo-application converts LaTeX functions which directly translate to CAS counterparts.

Functions without explicit CAS support are available for translation via a DRMF package (under development).

The following LaTeX input ...

{\displaystyle \kappa }

${\displaystyle \kappa }$

... is translated to the CAS output ...

Semantic latex: \kappa

Confidence: 0

Mathematica

Translation: \[Kappa]

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\[Kappa]

Free variables

\[Kappa]

Tests

Symbolic

Numeric

SymPy

Translation: Symbol('kappa')

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Sub Equations

Symbol('kappa')

Free variables

Symbol('kappa')

Tests

Symbolic

Numeric

Maple

Translation: kappa

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Sub Equations

kappa

Free variables

kappa

Tests

Symbolic

Numeric

Dependency Graph Information

Is part of

$\kappa ^{2}=n(n+1)k^{2}$

$B\wp (x)=-\kappa ^{2}\operatorname {sn} ^{2}x$

${\frac {d^{2}y}{dx^{2}}}+(\Lambda -\kappa ^{2}\operatorname {sn} ^{2}x-\Omega ^{2}k^{4}\operatorname {sn} ^{4}x)y=0$

$\Omega =0,k=0,\kappa =2h,\Lambda -2h^{2}=\lambda ,x=z\pm {\frac {\pi }{2}}$

${\begin{aligned}\Lambda (q)={}&q\kappa -{\frac {1}{2^{3}}}(1+k^{2})(q^{2}+1)-{\frac {q}{2^{6}\kappa }}\{(1+k^{2})^{2}(q^{2}+3)-4k^{2}(q^{2}+5)\}\\[6pt]&{}-{\frac {1}{2^{10}\kappa ^{2}}}{\Big \{}(1+k^{2})^{3}(5q^{4}+34q^{2}+9)-4k^{2}(1+k^{2})(5q^{4}+34q^{2}+9)\\[6pt]&{}-384\Omega ^{2}k^{4}(q^{2}+1){\Big \}}-\cdots ,\end{aligned}}$

$q-q_{0}=\mp 2{\sqrt {\frac {2}{\pi }}}\left({\frac {1+k}{1-k}}\right)^{-\kappa /k}\left({\frac {8\kappa }{1-k^{2}}}\right)^{q_{0}/2}{\frac {1}{[(q_{0}-1)/2]!}}\left[1-{\frac {3(q_{0}^{2}+1)(1+k^{2})}{2^{5}\kappa }}+\cdots \right]$

${\begin{aligned}\Lambda _{\pm }(q)\simeq {}&\Lambda (q_{0})+(q-q_{0})\left({\frac {\partial \Lambda }{\partial q}}\right)_{q_{0}}+\cdots \\[6pt]={}&\Lambda (q_{0})+(q-q_{0})\kappa \left[1-{\frac {q_{0}(1+k^{2})}{2^{2}\kappa }}-{\frac {1}{2^{6}\kappa ^{2}}}\{3(1+k^{2})^{2}(q_{0}^{2}+1)-4k^{2}(q_{0}^{2}+2q_{0}+5)\}+\cdots \right]\\[6pt]\simeq {}&\Lambda (q_{0})\mp 2\kappa {\sqrt {\frac {2}{\pi }}}\left({\frac {1+k}{1-k}}\right)^{-\kappa /k}\left({\frac {8\kappa }{1-k^{2}}}\right)^{q_{0}/2}{\frac {1}{[(q_{0}-1)/2]!}}{\Big [}1-{\frac {1}{2^{5}\kappa }}(1+k^{2})(3q_{0}^{2}+8q_{0}+3)\\[6pt]&{}+{\frac {1}{3.2^{11}\kappa ^{2}}}\{3(1+k^{2})^{2}(9q_{0}^{4}+8q_{0}^{3}-78q_{0}^{2}-88q_{0}-87)\\[6pt]&{}+128k^{2}(2q_{0}^{3}+9q_{0}^{2}+10q_{0}+15)\}-\cdots {\Big ]}.\end{aligned}}$

Description

constant

ellipsoidal equation

ellipsoidal wave equation

elliptic modulus of the Jacobian elliptic function

general form of Lamé 's equation

equation

Mathieu equation

elliptic sine function

integer

case

elliptic modulus

meromorphic function

solution

whole complex plane

important case

term

boundary condition

Müller

ellipsoidal wave

period

prime meaning

quarter period

Asymptotic expansion of periodic ellipsoidal wave function

asymptotic expansion

eigenvalue

Ince

odd integer

calculation for Mathieu function

Lamé function

large value

oblate spheroidal wave function

prolate spheroidal wave

limit of the Mathieu equation

Lamé equation

expression

expression of the Mathieu case

Complete translation information:

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Wikitext context	{{short description\|Solutions of Lamé's equation}} In mathematics, a '''Lamé function''', or '''ellipsoidal harmonic function''', is a solution of '''Lamé's equation''', a second-order [[ordinary differential equation]]. It was introduced in the paper {{harvs\|first=Gabriel\|last= Lamé\|authorlink= Gabriel Lamé\|year=1837}}. Lamé's equation appears in the method of [[separation of variables]] applied to the [[Laplace equation]] in [[elliptic coordinates]]. In some special cases solutions can be expressed in terms of polynomials called '''Lamé polynomials'''. == The Lamé equation == Lamé's equation is :<math>\frac{d^2y}{dx^2} + (A+B\weierp(x))y = 0, </math> where ''A'' and ''B'' are constants, and <math>\wp</math> is the [[Weierstrass elliptic function]]. The most important case is when <math> B\weierp(x) = - \kappa^2 \operatorname{sn}^2x </math>, where [[sn (elliptic function)\|<math>\operatorname{sn}</math> is the elliptic sine function]], and <math> \kappa^2 = n(n+1)k^2 </math> for an integer ''n'' and <math> k</math> the elliptic modulus, in which case the solutions extend to meromorphic functions defined on the whole complex plane. For other values of ''B'' the solutions have [[branch point]]s. By changing the independent variable to <math>t</math> with <math> t=\operatorname{sn} x</math>, Lamé's equation can also be rewritten in algebraic form as : <math>\frac{d^2y}{dt^2} +\frac{1}{2}\left(\frac{1}{t-e_1}+\frac{1}{t-e_2}+\frac{1}{t-e_3}\right) \frac{dy}{dt} - \frac{A+Bt}{4(t-e_1)(t-e_2)(t-e_3)}y = 0, </math> which after a change of variable becomes a special case of [[Heun's equation]]. A more general form of Lamé's equation is the [[ellipsoidal equation]] or [[ellipsoidal wave equation]] which can be written (observe we now write <math>\Lambda</math>, not <math>A</math> as above) :<math>\frac{d^2y}{dx^2} + (\Lambda - \kappa^2 \operatorname{sn}^2x - \Omega^2k^4 \operatorname{sn}^4x)y = 0, </math> where <math> k </math> is the elliptic modulus of the Jacobian elliptic functions and <math> \kappa</math> and <math> \Omega</math> are constants. For <math>\Omega = 0</math> the equation becomes the Lamé equation with <math>\Lambda = A</math>. For <math> \Omega = 0, k = 0, \kappa = 2h, \Lambda -2h^2 = \lambda, x= z \pm \frac{\pi}{2}</math> the equation reduces to the [[Mathieu equation]] :<math> \frac{d^2y}{dz^2} + (\lambda - 2h^2\cos 2z)y = 0. </math> The Weierstrassian form of Lamé's equation is quite unsuitable for calculation (as Arscott also remarks, p. 191). The most suitable form of the equation is that in Jacobian form, as above. The algebraic and trigonometric forms are also cumbersome to use. Lamé equations arise in quantum mechanics as equations of small fluctuations about classical solutions—called [[periodic instantons]], bounces or bubbles—of Schrödinger equations for various periodic and anharmonic potentials.<ref>H. J. W. Müller-Kirsten, ''Introduction to Quantum Mechanics: Schrödinger Equation and Path Integral'', 2nd ed. World Scientific, 2012, {{isbn\|978-981-4397-73-5}}</ref><ref>{{cite journal \| last=Liang \| first=Jiu-Qing \| last2=Müller-Kirsten \| first2=H.J.W. \| last3=Tchrakian \| first3=D.H. \| title=Solitons, bounces and sphalerons on a circle \| journal=Physics Letters B \| publisher=Elsevier BV \| volume=282 \| issue=1-2 \| year=1992 \| issn=0370-2693 \| doi=10.1016/0370-2693(92)90486-n \| pages=105–110}}</ref> ==Asymptotic expansions== Asymptotic expansions of periodic ellipsoidal wave functions, and therewith also of Lamé functions, for large values of <math>\kappa </math> have been obtained by Müller.<ref>{{cite journal \| last=W. Müller \| first=Harald J. \| title=Asymptotic Expansions of Ellipsoidal Wave Functions and their Characteristic Numbers \| journal=Mathematische Nachrichten \| publisher=Wiley \| volume=31 \| issue=1-2 \| year=1966 \| issn=0025-584X \| doi=10.1002/mana.19660310108 \| pages=89–101 \| language=de}}</ref><ref>{{cite journal \| last=Müller \| first=Harald J. W. \| title=Asymptotic Expansions of Ellipsoidal Wave Functions in Terms of Hermite Functions \| journal=Mathematische Nachrichten \| publisher=Wiley \| volume=32 \| issue=1-2 \| year=1966 \| issn=0025-584X \| doi=10.1002/mana.19660320106 \| pages=49–62 \| language=de}}</ref><ref>{{cite journal \| last=Müller \| first=Harald J. W. \| title=On Asymptotic Expansions of Ellipsoidal Wave Functions \| journal=Mathematische Nachrichten \| publisher=Wiley \| volume=32 \| issue=3-4 \| year=1966 \| issn=0025-584X \| doi=10.1002/mana.19660320305 \| pages=157–172 \| language=de}}</ref> The asymptotic expansion obtained by him for the eigenvalues <math>\Lambda </math> is, with <math> q </math> approximately an odd integer (and to be determined more precisely by boundary conditions – see below), : <math> \begin{align} \Lambda(q) = {} & q\kappa - \frac{1}{2^3}(1+k^2)(q^2+1) - \frac{q}{2^6\kappa}\{(1+k^2)^2(q^2+3) - 4k^2(q^2+5)\} \\[6pt] & {} -\frac{1}{2^{10}\kappa^2} \Big\{(1+k^2)^3(5q^4+34q^2+9) - 4k^2(1+k^2)(5q^4+34q^2+9) \\[6pt] & {} - 384\Omega^2k^4(q^2+1)\Big\} - \cdots , \end{align} </math> (another (fifth) term not given here has been calculated by Müller, the first three terms have also been obtained by Ince<ref>{{cite journal \| last=Ince \| first=E. L. \| title=VII—Further Investigations into the Periodic Lamé Functions \| journal=Proceedings of the Royal Society of Edinburgh \| publisher=Cambridge University Press (CUP) \| volume=60 \| issue=1 \| year=1940 \| issn=0370-1646 \| doi=10.1017/s0370164600020071 \| pages=83–99}}</ref>). Observe terms are alternately even and odd in <math>q</math> and <math>\kappa</math> (as in the corresponding calculations for [[Mathieu function]]s, and [[oblate spheroidal wave functions]] and [[prolate spheroidal wave functions]]). With the following boundary conditions (in which <math> K(k)</math> is the quarter period given by a complete elliptic integral) : <math> \operatorname{Ec}(2K) = \operatorname{Ec}(0) = 0,\;\; \operatorname{Es}(2K) = \operatorname{Es}(0) = 0, </math> as well as (the [[Notation_for_differentiation#Lagrange's_notation\|prime]] meaning derivative) : <math> (\operatorname{Ec})^'_{2K} = (\operatorname{Ec})^'_0 = 0, \;\; (\operatorname{Es})^'_{2K} = (\operatorname{Es})^'_0 = 0, </math> defining respectively the ellipsoidal wave functions : <math>\operatorname{Ec}^{q_0}_n, \operatorname{Es}^{q_0+1}_n, \operatorname{Ec}^{q_0-1}_n, \operatorname{Es}^{q_0}_n</math> of periods <math>4K, 2K, 2K, 4K, </math> and for <math>q_0=1,3,5, \ldots</math> one obtains : <math>q-q_0 = \mp 2\sqrt{\frac{2}{\pi}} \left( \frac{1+k}{1-k}\right)^{-\kappa/k} \left( \frac{8\kappa}{1-k^2}\right)^{q_0/2}\frac{1}{[(q_0-1)/2]!} \left[ 1 - \frac{3(q^2_0+1)(1+k^2)}{2^5\kappa} + \cdots \right]. </math> Here the upper sign refers to the solutions <math>\operatorname{Ec}</math> and the lower to the solutions <math>\operatorname{Es}</math>. Finally expanding <math>\Lambda(q)</math> about <math>q_0,</math> one obtains : <math> \begin{align} \Lambda_{\pm}(q) \simeq {} & \Lambda(q_0) + (q-q_0)\left(\frac{\partial \Lambda}{\partial q} \right)_{q_0} + \cdots \\[6pt] = {} & \Lambda(q_0) +(q-q_0)\kappa \left[1 - \frac{q_0(1+k^2)}{2^2\kappa} - \frac{1}{2^6\kappa^2}\{3(1+k^2)^2(q^2_0+1)-4k^2(q^2_0+2q_0+5)\}+ \cdots\right] \\[6pt] \simeq {} & \Lambda(q_0) \mp 2\kappa\sqrt{\frac{2}{\pi}} \left( \frac{1+k}{1-k} \right)^{-\kappa/k} \left( \frac{8\kappa}{1-k^2}\right)^{q_0/2} \frac{1}{[(q_0-1)/2]!} \Big[ 1 - \frac{1}{2^5\kappa}(1+k^2)(3q^2_0+8q_0+3) \\[6pt] & {} + \frac{1}{3.2^{11}\kappa^2}\{3(1+k^2)^2(9q^4_0+8q^3_0-78q^2_0-88q_0-87) \\[6pt] & {} + 128k^2(2q^3_0+9q^2_0+10q_0+15)\} - \cdots\Big]. \end{align} </math> In the limit of the Mathieu equation (to which the Lamé equation can be reduced) these expressions reduce to the corresponding expressions of the Mathieu case (as shown by Müller). ==Notes== {{Reflist}} ==References== {{Citation \| last = Arscott \| first = F. M. \| title = Periodic Differential Equations \| place = Oxford \| publisher = [[Pergamon Press]] \| pages = 191–236 \| year = 1964 }}. {{Citation \| last = Erdélyi \| first = Arthur \| authorlink = Arthur Erdélyi \| last2 = Magnus \| first2 = Wilhelm \| author2-link = Wilhelm Magnus \| last3 = Oberhettinger \| first3 = Fritz \| last4 = Tricomi \| first4 = Francesco G. \| author4-link = Francesco Tricomi \| title = Higher transcendental functions \| series = Bateman Manuscript Project \| volume = Vol. III \| place = New York–Toronto–London \| publisher = [[McGraw-Hill]] \| pages = XVII + 292 \| year = 1955 \| url = http://apps.nrbook.com/bateman/Vol3.pdf \| mr = 0066496 \| zbl = 0064.06302 }}. {{Citation \| first = G. \| last = Lamé \| author-link = Gabriel Lamé \| title = Sur les surfaces isothermes dans les corps homogènes en équilibre de température \| journal = [[Journal de mathématiques pures et appliquées]] \| volume = 2 \| year = 1837 \| pages = 147–188 \| url = http://gallica.bnf.fr/ark:/12148/bpt6k163818/f155.image }}. Available at [[Gallica]]. {{springer\|id=L/l057400\|first=N. Kh.\|last= Rozov\|title=Lamé equation}} {{springer\|id=L/l057410\|first=N. Kh.\|last= Rozov\|title=Lamé function}} {{dlmf\|id=29\|first=H. \|last=Volkmer}} * {{Citation \| first = Harald J. W. \| last = Müller-Kirsten \|title = Introduction to Quantum Mechanics: Schrödinger Equation and Path Integral, 2nd ed. \|publisher = World Scientific \|year = 2012 }} {{DEFAULTSORT:Lame function}} [[Category:Special functions]]
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