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<nowiki>problema aperto; problema no resuelto; problème ouvert; 开放问题; адкрытая праблема; nesolvita problemo; open problem; 미해결 문제; problema no resolt; problemă deschisă; offenes Problem; problema em aberto; åpent problem; masalah terbuka; 開放問題; uløst problem; odprti problem; 開かれた問題; problema em aberto; בעיה פתוחה במתמטיקה; olöst problem; problem otwarty; нерозв'язана проблема; open probleem; 開放問題; 开放问题; отворен проблем; ratkaisematon ongelma; problema sen resolver; مسألة مفتوحة; ανοιχτό πρόβλημα; нерешённые задачи; problema noto che si presume abbia una soluzione oggettiva e verificabile, ma che non è stato ancora risolto; problema conhecido que se supõe ter uma solução objetiva e verificável, mas que ainda não foi resolvido; välkänt problem som tros gå att lösa, men ännu inte har lösts; טענה ידועה שטרם נמצאה לה הוכחה או הפרכה; ein bekanntes Problem, von dem angenommen wird, dass es eine objektive und verifizierbare Lösung hat, die aber bislang nicht bekannt ist; problema conhecido que se supõe ter uma solução objetiva e verificável, mas que ainda não foi resolvido; problema aínda non resolvido; γνωστό πρόβλημα ή ερώτημα που θεωρείται ότι διαθέτει αντικειμενική και επαληθεύσιμη λύση ή εξήγηση, αλλά παραμένει ανεπίλυτο; known problem or question which is thought to have an objective and verifiable solution or explanation, but which has not yet been solved; problema non risolto; problema irrisolto; problema ancora non risolto; problema ancora irrisolto; problemas em aberto; avoin ongelma; öppen fråga; 开放问题; problemas aún no resueltos; preguntas abiertas; problemas sin resolver; problema aun no resuelto; pregunta abierta; problema abierto; problemas no resueltos; problemas aun no resueltos; problema aún no resuelto; casos sin respuesta; open question; unsolved problem; unresolved question; unresolved problem; unresolved issue; открытая проблема; нерешённая задача; problemas em aberto; nerešeni problem; 열린 문제; problema aberto; неразьвязаная праблема; нявырашаная праблема; ανεπίλυτο πρόβλημα; åbent problem; åbent spørgsmål</nowiki>
open problem
known problem or question which is thought to have an objective and verifiable solution or explanation, but which has not yet been solved