...as the SURFACE of
an n-dimensional superfluid.
The Big Bang Theory Season 8, Episode 23
in the Earth's
SURFACE.
The Big Bang Theory Season 7, Episode 3
that's just a doodle of
a hyperelliptic Riemann SURFACE.
The Big Bang Theory Season 7, Episode 20
...with silicone RTV
to provide a better mounting SURFACE?
The Big Bang Theory Season 2, Episode 18
If there is life beneath
the SURFACE of these planets,
The Big Bang Theory Season 11, Episode 10