EntityQ2496877· pop 10· linked from 37 articlesHilbert's seventeenth problemSign in to saveWhen are rational functions sums of quotients of squaresConnectionsAmerican Mathematical SocietyEntityhomogeneous polynomialEntityInternational Standard Book NumberEntityDavid HilbertEntitydigital object identifierEntityInternational Standard Serial NumberEntitycomplex analysisEntityJSTOROrganizationbibcodeEntitysquareEntityQ118398EntitysumEntityCambridge University PressEntityHilbert's problemsEntityquotientEntityrational functionEntitycontinuum hypothesisEntitycomputational complexity theoryEntityQ22908627EntityEmil ArtinEntityCategoriesHilbert's problemsReal algebraic geometry