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Infra notation is a notation for large numbers made by Wikia user Nirvana Supermind.[1].

The notation is currently composed of 1 parts, which is as follows:

## Basic notation

Basic Infra Notation (BIN) is the 1st part of Infra Notation. It’s the simplest and weakest one. The rules for it are:

1. I<> = 0
2. I<a> = 10a
3. I<#,0> = I<#>
4. I<a,b> = I<I<...<I<a,b-1>,b-1>,...>,b-1> (b>0) for a times

Where # is a part of said array (a string of entries and commas, it can also be empty). If there are two or more distinct rules to apply to a single expression, the uppermost-numbered rule which is applicable and whose result is a valid expression will be applied. The creator said that this notation most likely reaches fω(n) in the Fast-growing hierarchy.

### Example

I<3,1>

= I<I<...<I<3,0>,0>,...>,0> for 3 times

= I<I<I<3,0>,0>,0>

= I<I<I<3>>>

= 10101000

## Sources

1. Nirvana Supermind. Infra Notation - Integral View
2. Nirvana Supermind. Basic Infra Notation - Integral View
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