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On parallelogram functional equations

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References

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  3. — On the functional equations|f(x)+iy)|=|f(x)+f(iy)| and|f(x+iy)|=|f(x)-f(iy)| and on Ivory's theorem. Canadian Mathematical Bulletin9, 473–480 (1966).

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  4. — On certain functional equations connected with two invariant properties under mapping from thez-plane into thew-plane. Glasnik Mat.-Fiz. Astr. Društvo Mat. Fiz. Hrvatske2 (2), 65–71 (1967).

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  1. Faculty of Mathematics, University of Waterloo, Waterloo, Ontario, Canada

    Hiroshi Haruki

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  1. Hiroshi Haruki
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Haruki, H. On parallelogram functional equations. Math Z 104, 358–363 (1968). https://doi.org/10.1007/BF01110427

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