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The functional equation \(f(x + y - xy) + f(xy) = f(x) + f(y)\). (English) Zbl 0203.46202


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References:

[1] Daróczy, Z.,Über die Funktionalgleichung f(xy)+f(x+yy)=f(x)+f(y), Publ. Math. Debrecen (to appear). · Zbl 0202.15102
[2] Światak, H.,On the Functional Equation f(x+yy)+f(xy)=f(x)+f(y), Mat. Vesnik5 (20, 177–182 (1968). · Zbl 0165.50001
[3] Światak, H.,Remarks on the Functional Equation f(x+yy)+f(xy)=f(x)+f(y), Aequationes Math.1, 239–241 (1968). · Zbl 0165.17202 · doi:10.1007/BF01817420
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