An Elliptic curve for solving $W^4+X^4=Y^4+Z^4$
问题内容
It is well known that a parameterization for the equation $$W^2+X^2=Y^2+Z^2$$ is given by:
$$(W,X,Y,Z)=(a+b,ab-1,ab+1,a-b).$$
I have found a similar type of parameterization for the fourth-power equation: $$W^4+X^4=Y^4+Z^4$$ where $W = d+e$, $X = cde-1$, $Y = d-e$, and $Z = cde+1$, provided that the elliptic curve $$y^2 = x^3 - 27(c^6+14c^3+1)x - 54(c^9-33c^6-33c^3-1)$$ possesses a rational point $(x, y)$ given by: $$x = \frac{18 + 18d - 3(1 + c^3 + 6c^3d)e^2}{e^2},\qquad y = \frac{-6x + 36c^3 + 36}{e}$$
I am unable to find an initial rational point using only pen-and-paper methods. While I understand this is typically computed using a computer algebra system (CAS), I currently do not have access to one.
Could anyone help me find the initial rational point, as well as any additional rational points?
- Can we find solutions where the sum of two odd fourth powers is equal to another sum of two odd fourth powers?
- Can the sum of two odd fourth powers be expressed as a sum of two even fourth powers?
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