english: My uncle was a very prominent mathematician, and he told me, "Look, there's a problem which I could not solve 25 years ago, and which nobody can solve.
non_english: Amcam çok ünlü bir matematikçiydi ve bana dedi ki, "Bak, benim 25 yıldır çözemediğim bir problem var, ve kimse çözemez.