Hi, If $\displaystyle D>C\geq B>A>0$ and we have 3 squares in arithmetic progression $\displaystyle x_0, x_1, x_2$ where $\displaystyle x_2-x_1=x_1-x_0=d$ can $\displaystyle d=2(A^2-B^2)CD$ ? Thanks for any help\pointers
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