Note that
$\uparrow$ is not a
number: it is the value of a game, which is a more subtle concept. Also
note that
$\frac 1 \uparrow$ is not
defined since it would be bigger than all surreal numbers and there are
no such numbers. (In fact, it does exist but is one of the Oneiric
numbers.)

## Comments

How do & relate to & ?

What is the value of ? ? ? Or..?