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### GCD

Greatest common divisors (GCD) over algebraic number fields are computed by `cr_gcda()` function. This function computes GCD by using modular computation and Chinese remainder theorem and it works for the case where the ground field is a multiple extension.

    [63] A=newalg(t^9-15*t^6-87*t^3-125);
    (#0)
    [64] B=newalg(75*s^2+(10*A^7-175*A^4-470*A)*s+3*A^8-45*A^5-261*A^2);
    (#1)
    [65] P1=75*x^2+(150*B+10*A^7-175*A^4-395*A)*x
    +(75*B^2+(10*A^7-175*A^4-395*A)*B+13*A^8-220*A^5-581*A^2)$
    [66] P2=x^2+A*x+A^2$
    [67] cr_gcda(P1,P2);
    27*x+((#0^6-19*#0^3-65)*#1-#0^7+19*#0^4+38*#0)

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