In Soviet Russia, Math does you…

X, a place,  is presently named after the commie dude shown in pic1.

X was previously known as Y, which figures in a  famous problem, first solved by the math dude shown in pic2.

And in the general direction of X, I present the clue pic3.

Full connections please. [ X – pic1, Y –  pic2 ]

pic1

pic1

pic2

pic2

pic3

pic3

Cracked completely by Srikanth, Royan, Kaustuba, Tul and Goutham.

and partially by wanderlust

Answer:
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