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Omni-MATH / Find all functions f from the reals to the reals such that (f(x)+f(z))(f(y)+f(t))=f(xy−zt)+f(xt+yz) for all real x,y,z,t. · Discussion

Discussing Find all functions f from the reals to the reals such that (f(x)+f(z))(f(y)+f(t))=f(xy−zt)+f(xt+yz) for all real x,y,z,t. · Omni-MATH

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