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Question: Why do I get this error when solving a union of two sets?

Question:Why do I get this error when solving a union of two sets?

Saalehorizontale 35 Maple 2024
solve inequality set
December 08 2024
0

Hey guys, 

in the attached file you can see my problem. Since Maple was not able to calculate my set with 8 equations, 8 variables and 13 inequalities I had to split in into two steps. Here you can see how I try to take one solutions of what I got with solve onto 8 equations with 8 variables and to solve this together with my inequalities. It never was a problem before. So ow I get a weird error I dont understand.

> 

restart; inequalities := {0 < k, 0 < m, 0 < s, 0 < x, 0 < y, 0 < n+(p-1)*s, 0 < (m*y-1)*n+(m*x-m+1)*(1-p), 0 < (m*x-m-s+1)*p+m*y*(s-n), 1 < x+y, k < 1, m < 1, s < t, t < 1}; solve(`union`({k = (x*(1-sqrt(x))+sqrt(x)-2*x)/((x^2-3*x+1)*x), m = (sqrt(x)+x)/(x-1), n = (sqrt(x)+x)/(x-1), p = (-1-sqrt(x))/(x-1), s = (-1-sqrt(x))/(x-1), t = (2*x*(1-sqrt(x))+1+sqrt(x)-5*x)/(x^2-3*x+1), y = 1-sqrt(x)}, inequalities)); inequalities := {0 < k, 0 < m, 0 < s, 0 < x, 0 < y, 0 < n+(p-1)*s, 0 < (m*y-1)*n+(m*x-m+1)*(1-p), 0 < (m*x-m-s+1)*p+m*y*(s-n), 1 < x+y, k < 1, m < 1, s < t, t < 1}

Error, (in unknown) invalid input: SolveTools:-Inequality expects its 1st argument, eqns, to be of type {list, set}({`<`, `<=`, `=`}), but received [p < 1, -p < 0, And(2*argument((p-1)/p) <= Pi,-Pi < 2*argument((p-1)/p))]

  
> 

restart; solve(`union`({k = (x*(1-sqrt(x))+sqrt(x)-2*x)/((x^2-3*x+1)*x), m = (sqrt(x)+x)/(x-1), n = (sqrt(x)+x)/(x-1), p = (-1-sqrt(x))/(x-1), s = (-1-sqrt(x))/(x-1), t = (2*x*(1-sqrt(x))+1+sqrt(x)-5*x)/(x^2-3*x+1), y = 1-sqrt(x)}, {0 < x, 0 < y}))

{k = p^3/(p^3-2*p+1), m = -p+1, n = -p+1, s = p, t = (3*p-2)*p/(p^2+p-1), x = (p^2-2*p+1)/p^2, y = 1-((p^2-2*p+1)/p^2)^(1/2), 3/2+(1/2)*5^(1/2) < p}, {k = p^3/(p^3-2*p+1), m = -p+1, n = -p+1, s = p, t = (3*p-2)*p/(p^2+p-1), x = (p^2-2*p+1)/p^2, y = 1-((p^2-2*p+1)/p^2)^(1/2), 1 < p, p < 3/2+(1/2)*5^(1/2)}, {k = p^3/(p^3-2*p+1), m = -p+1, n = -p+1, s = p, t = (3*p-2)*p/(p^2+p-1), x = (p^2-2*p+1)/p^2, y = 1-((p^2-2*p+1)/p^2)^(1/2), 1/2 < p, p < (1/2)*5^(1/2)-1/2}, {k = p^3/(p^3-2*p+1), m = -p+1, n = -p+1, s = p, t = (3*p-2)*p/(p^2+p-1), x = (p^2-2*p+1)/p^2, y = 1-((p^2-2*p+1)/p^2)^(1/2), p < 1, (1/2)*5^(1/2)-1/2 < p}

 (1)
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restart; solve(`union`({k = (x*(1-sqrt(x))+sqrt(x)-2*x)/((x^2-3*x+1)*x), m = (sqrt(x)+x)/(x-1), n = (sqrt(x)+x)/(x-1), p = (-1-sqrt(x))/(x-1), s = (-1-sqrt(x))/(x-1), t = (2*x*(1-sqrt(x))+1+sqrt(x)-5*x)/(x^2-3*x+1), y = 1-sqrt(x)}, {0 < s, 0 < x, 0 < y}))

Error, (in unknown) invalid input: SolveTools:-Inequality expects its 1st argument, eqns, to be of type {list, set}({`<`, `<=`, `=`}), but received [-p < 0, And(2*argument((p-1)/p) <= Pi,-Pi < 2*argument((p-1)/p))]

  
 

NULL

So my question is why does this error occur? And what does it mean? the "but received..." argument in the error makes no sense to me. Why does it happen when I add 0<s but 0<x,0<y is okay?

Thank you in advance

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