i (representation of language level)

i (/aɪ/), always lowercase, can be used in algebraic notation to represent language level, following Krashen, in the context of his comprehensible input hypothesis:

• "i" is the language level.
• "i + 1" is language a level harder, not well understood in the given context.
• "i - 1" is language a level easier, and well understood in the given context.

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