## open-axiom-help — Discussions about uses of OpenAxiom

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 [open-axiom-help] Parametric to implicit form From: Russell Shaw - 2010-09-28 13:07:25 ```Hi, I have the equations with parametric variable t, dependent variables x and y, and constants a,b,c,d,e,f: x = a.t^2 + b.t + c y = d.t^2 + e.t + f I want to substitute away t to get the implicit form, and determine the constants A-F in terms of a-e above: A.x^2 + B.y^2 + C.xy + D.x + E.y + F = 0 i couldn't see from a scan of the Vol.1 manual if Axiom can do this. -- regards, Russell Shaw ```
 [open-axiom-help] Ratio test for series From: Игорь Пашев - 2010-09-01 18:04:07 ```I'm writing ratio convergence test for series (aka d'Alembert's test) and looking for criticism Function 'numeric' is, for example, a(n) = 1/%e^n testRatio a ==     l := limit (a(n+1)/a(n), n=%plusInfinity)     l case "failed" => "failed"     numeric(l) < 1  => true     numeric(l) > 1  => false     "failed" ```

Showing 2 results of 2