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Author: WikiMatrix
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English[en]
Gray also lists the 18th problem as "open" in his 2000 book, because the sphere-packing problem (also known as the Kepler conjecture) was unsolved, but a solution to it has now been claimed.
Finnish[fi]
Gray listasi 18. ongelman avoimeksi vuonna 2000 ilmestyneessä teoksessa, koska pallojen pakkausongelma (Keplerin konjektuuri) oli ratkaisematta, mutta ratkaisu on sittemmin löydetty (katso viite alla).