...on a SURFACE located
at the farthest reaches of our cosmos.
The Big Bang Theory Season 6, Episode 5
that's just a doodle of
a hyperelliptic Riemann SURFACE.
The Big Bang Theory Season 7, Episode 20
If there is life beneath
the SURFACE of these planets,
The Big Bang Theory Season 11, Episode 10
or under the icy SURFACE
of Europa?
The Big Bang Theory Season 11, Episode 10
in the Earth's
SURFACE.
The Big Bang Theory Season 7, Episode 3