Maths for ML / Notation

⊂\subset

proper subset (usually)

SetsIntermediate

Say it “is a strict subset of”

Usually means a subset that is not the whole set. Some authors use ⊂ to mean ⊆ — check the paper's convention.

Example

N⊂Z\mathbb{N} \subset \mathbb{Z}

In code

A < B  # Python sets

Where you’ll see it in ML

Feature subsets and nested hypothesis classes.

Don’t confuse it with

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