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The Extended Universe Size Index (EUSI) is a number, which indicates the deepest nestation of other verses within a specific verse.

It can be used to tell the size of a universe, without needing to say its size, due to most verses having beyond infinite sizes, or ordinals/cardinals that aren't named yet.

## Definition

We define a function

, now we extend it to

fixed point.

After this, we can create another extention, by borrowing some things from other functions, such as the veblen function, by asserting:

If we say that