MathAction SandBoxDemoXFreeAlgebra

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SandBoxDemoXFreeAlgebra

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fricas -- Category: XFreeAlgebra(vl : OrderedSet, R : Ring) : Category

++ Author: Michel Petitot petitot@lifl.fr -- ++ Date Created: 91 -- should be enough to impl TensorAlgebra(R-Module), R comm. ? -- see also SandBoxFreeProduct by B.P.
B:=OrderedVariableList [b[i] for i in 1..5]

$\label{eq1}\hbox{\axiomType{OrderedVariableList}\ } ([ b [ 1 ] , b [ 2 ] , b [ 3 ] , b [ 4 ] , b [ 5 ] ])$

Type: Type

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R:=Expression Integer

$\label{eq2}\hbox{\axiomType{Expression}\ } (\hbox{\axiomType{Integer}\ })$

Type: Type

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X:=XDistributedPolynomial(B,R)

$\label{eq3}\hbox{\axiomType{XDistributedPolynomial}\ } (\hbox{\axiomType{OrderedVariableList}\ } ([ b [ 1 ] , b [ 2 ] , b [ 3 ] , b [ 4 ] , b [ 5 ] ]) , \hbox{\axiomType{Expression}\ } (\hbox{\axiomType{Integer}\ }))$

Type: Type

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b:=[a::X for a in enumerate()$B]

$\label{eq4}\left[{b_{1}}, \:{b_{2}}, \:{b_{3}}, \:{b_{4}}, \:{b_{5}}\right]$

Type: List(XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer)))

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t0:=0$X

$\label{eq5}0$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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t1:=1$X

$\label{eq6}1$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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t2:=b.1*b.2

$\label{eq7}{b_{1}}\ {b_{2}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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t3:=b.3*t2 - t2*b.3

$\label{eq8}{{b_{3}}\ {b_{1}}\ {b_{2}}}-{{b_{1}}\ {b_{2}}\ {b_{3}}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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vl:=varList t3

$\label{eq9}\left[{b_{3}}, \:{b_{2}}, \:{b_{1}}\right]$

Type: List(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]))

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leadingMonomial t3

$\label{eq10}-{{b_{1}}\ {b_{2}}\ {b_{3}}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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reductum t3

$\label{eq11}{b_{3}}\ {b_{1}}\ {b_{2}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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degree t3

$\label{eq12}3$

Type: PositiveInteger?

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t4:=x*t3+y^2*t2+z^3*t1

$\label{eq13}{{z}^{3}}+{{{y}^{2}}\ {b_{1}}\ {b_{2}}}+{x \ {b_{3}}\ {b_{1}}\ {b_{2}}}-{x \ {b_{1}}\ {b_{2}}\ {b_{3}}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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degree t4

$\label{eq14}3$

Type: PositiveInteger?

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leadingMonomial t4

$\label{eq15}-{x \ {b_{1}}\ {b_{2}}\ {b_{3}}}$

Type: XDistributedPolynomial(OrderedVariableList([b[1],b[2],b[3],b[4],b[5]]),Expression(Integer))

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degree t4

$\label{eq16}3$

Type: PositiveInteger?

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leadingCoefficient t4

$\label{eq17}- x$

Type: Expression(Integer)

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coefficients t4

$\label{eq18}\left[ - x , \: x , \:{{y}^{2}}, \:{{z}^{3}}\right]$

Type: List(Expression(Integer))

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X has XFreeAlgebra(B,R)

$\label{eq19} \mbox{\rm true}$

Type: Boolean