Four-point characterizations of real inner product spaces von Freese, Raymond, Andalafte, Edward Z.

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New intrinsic four point properties which characterize hyperbolic and euclidean spaces von Andalafte, Edward Z., Freese, Raymond W.

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An extension of pythagorean and isosceles orthogonality and a characterization of inner-product spaces von Diminnie, Charles R, Freese, Raymond W, Andalafte, Edward Z

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Characterization of inner product spaces in V- and L-spaces von Andalafte, Edward Z., Freese, Raymond W.

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Criteria for unique metric lines von Freese, Raymond W., Andalafte, Edward Z.

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An equilateral four point property which characterizes generalized euclidean spaces von Andalafte, Edward Z., Freese, Raymond W.

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AN INTRINSIC ISOSCELES FOUR POINT PROPERTY WHICH CHARACTERIZES HYPERBOLIC AND EUCLIDEAN SPACES von Andalafte, Edward Z.

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A new class of four-point properties which characterize euclidean spaces von Freese, Raymond W., Andalafte, Edward Z.

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A metric characterization of "spherical" surfaces in n-dimensional hyperbolic space von Valentine, Joseph E.

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A Characterization of 2-Betweenness in 2-Metric Spaces von Freese, Raymond W., Andalafte, Edward Z.

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A Study of Generalized Orthogonality Relations in Normed Linear Spaces von Freese, Raymond W., Diminnie, Charles R., Andalafte, Edward Z.

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Angles in Normed Linear Spaces and a Characterization of Real Inner Product Spaces von Diminnie, Charles R., Andalafte, Edward Z., Freese, Raymond W.

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Angle Bisectors in Normed Linear Spaces von Freese, Raymond W., Diminnie, Charles R., Andalafte, Edward Z.

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Triangle Congruence Characterizations of Inner Product Spaces von Diminnie, Charles R., Andalafte, Edward Z., Freese, Raymond W.

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A Study of Generalized Orthogonality Relations in Normed Linear Spaces von Freese, Raymond W., Diminnie, Charles R., Andalafte, Edward Z.

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