About: http://dbpedia.org/resource/Hilbert's_fourth

Property	Value
dbo:description	one of twenty-three, asking to construct all metric spaces where lines resemble those on a sphere (en) cuestión matemática que implica construir todos los espacios métricos donde las líneas se parecen a las de una esfera (es)
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rdfs:label	Hilbert's fourth problem (en) Cuarto problema de Hilbert (es) Quarto problema de Hilbert (pt) Hilberts fjärde problem (sv) Четвёртая проблема Гильберта (ru) Четверта проблема Гільберта (uk) 希爾伯特第四問題 (zh)
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About: http://dbpedia.org/resource/Hilbert's_fourth_problem