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Question: How do I make these commands???

Question:How do I make these commands???

delvin 50 Maple 2020
syntax spam degree duplicate-question
July 30 2023
0

Hi,

I want to define the functions 10 and 11 and then put them in the eq equation, then simplify them and get the unknown values after the solve command, but there are error.

And value the function psi ?

NULL

NULL

> 

restart
> 

with(student)
> 

NULL

"U(xi[n]):=a[0]+sum(-a[i]*psi^(i)(xi[n]),i=1..1)+sum(-b[i]*psi^(-i)(xi[n]),i=1..1)+sum(-c[i]*((diff(psi,xi[n])^(i)))/(psi^(i)(xi[n])),i=1..1);"

Error, empty script base

Typesetting:-mambiguous(Typesetting:-mrow(Typesetting:-mi("U", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("ξ", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mfenced(Typesetting:-mi("n", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", font_style_name = "2D Input", mathvariant = "normal")), mathvariant = "normal"), Typesetting:-mo("≔", accent = "false", fence = "false", largeop = "false", lspace = "0.2777778em", mathvariant = "normal", movablelimits = "false", rspace = "0.2777778em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("a", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mn("0", mathvariant = "normal"), open = "[", close = "]", mathvariant = "normal"), Typesetting:-mo("+", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("sum", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mo("&uminus0;", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("a", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mi("i", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", mathvariant = "normal"), Typesetting:-mo("⋅", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-msup(Typesetting:-mi("ψ", font_style_name = "2D Input", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mi("i", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), superscriptshift = "0"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("ξ", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mfenced(Typesetting:-mi("n", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", mathvariant = "normal")), mathvariant = "normal"), Typesetting:-mo(",", accent = "false", fence = "false", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.3333333em", separator = "true", stretchy = "false", symmetric = "false"), Typesetting:-mi("i", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mo("=", accent = "false", fence = "false", largeop = "false", lspace = "0.2777778em", mathvariant = "normal", movablelimits = "false", rspace = "0.2777778em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", mathvariant = "normal"), Typesetting:-mo(".", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mo(".", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", mathvariant = "normal")), mathvariant = "normal"), Typesetting:-mo("+", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("sum", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mo("&uminus0;", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("b", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mi("i", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", mathvariant = "normal"), Typesetting:-mo("⋅", accent = "false", fence = "false", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-msup(Typesetting:-mi("ψ", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mrow(Typesetting:-mo("&uminus0;", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("i", fontstyle = "italic", mathvariant = "italic")), superscriptshift = "0"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("ξ", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mfenced(Typesetting:-mi("n", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", mathvariant = "normal")), mathvariant = "normal"), Typesetting:-mo(",", accent = "false", fence = "false", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.3333333em", separator = "true", stretchy = "false", symmetric = "false"), Typesetting:-mi("i", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mo("=", accent = "false", fence = "false", largeop = "false", lspace = "0.2777778em", mathvariant = "normal", movablelimits = "false", rspace = "0.2777778em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", mathvariant = "normal"), Typesetting:-mo(".", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mo(".", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", mathvariant = "normal")), mathvariant = "normal"), Typesetting:-mo("+", accent = "false", fence = "false", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("sum", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mo("&uminus0;", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.2222222em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mi("c", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mi("i", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", font_style_name = "2D Input", mathvariant = "normal"), Typesetting:-mo("⋅", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mfrac(Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("diff", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("ψ", font_style_name = "2D Input", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mo(",", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.3333333em", separator = "true", stretchy = "false", symmetric = "false"), Typesetting:-mi("ξ", font_style_name = "2D Input", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mfenced(Typesetting:-mi("n", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", font_style_name = "2D Input", mathvariant = "normal")), font_style_name = "2D Input", mathvariant = "normal"), Typesetting:-mambiguous(Typesetting:-msup(Typesetting:-merror("?"), Typesetting:-mi("i", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), superscriptshift = "0"), Typesetting:-merror("empty script base"))), font_style_name = "2D Input", mathvariant = "normal"), Typesetting:-mrow(Typesetting:-msup(Typesetting:-mi("ψ", font_style_name = "2D Input", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mi("i", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), superscriptshift = "0"), Typesetting:-mfenced(Typesetting:-mrow(Typesetting:-mi("ξ", font_style_name = "2D Input", fontstyle = "normal", mathvariant = "normal"), Typesetting:-mfenced(Typesetting:-mi("n", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), open = "[", close = "]", font_style_name = "2D Input", mathvariant = "normal")), font_style_name = "2D Input", mathvariant = "normal")), bevelled = "false", denomalign = "center", linethickness = "1", numalign = "center"), Typesetting:-mo(",", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.3333333em", separator = "true", stretchy = "false", symmetric = "false"), Typesetting:-mi("i", font_style_name = "2D Input", fontstyle = "italic", mathvariant = "italic"), Typesetting:-mo("=", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.2777778em", mathvariant = "normal", movablelimits = "false", rspace = "0.2777778em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", font_style_name = "2D Input", mathvariant = "normal"), Typesetting:-mo(".", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mo(".", accent = "false", fence = "false", font_style_name = "2D Input", largeop = "false", lspace = "0.2222222em", mathvariant = "normal", movablelimits = "false", rspace = "0.0em", separator = "false", stretchy = "false", symmetric = "false"), Typesetting:-mn("1", font_style_name = "2D Input", mathvariant = "normal")), font_style_name = "2D Input", mathvariant = "normal"), Typesetting:-mo(";", accent = "false", fence = "false", largeop = "false", lspace = "0.0em", mathvariant = "normal", movablelimits = "false", rspace = "0.2777778em", separator = "true", stretchy = "false", symmetric = "false")))

  
> 

NULL
> 

U(xi[n+1]) := U(xi[n]+d)

U(xi[n]+d)

 (1)
> 

U(xi[n-1]) := U(xi[n]-d)

U(xi[n]-d)

 (2)
> 

NULL

eq := c*(diff(U, xi[n]))*(U(xi[n])+u(xi[n-1]))*(U(xi[n])+u(xi[n+1]))-(2*(u(xi[n-1])-u(xi[n+1])))*(U(xi[n])^2)(1-U(xi[n])^2)

-2*(u(xi[n-1])-u(xi[n+1]))*(U(xi[n]))(1-U(xi[n])^2)^2

 (3)

NULL

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