[**knowledge base**]

The MEMBERSHIP RELATION and its underlying definitions are presented in this white paper (knowledge base).

https://doi.org/10.31219/osf.io/r9p2m

**Open Mathematics Collaboration**

Op. J. Math. Phys.

Volume 3, Article 221, 2021 [IR]

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# The membership relation

[**knowledge base**]

The MEMBERSHIP RELATION and its underlying definitions are presented in this white paper (knowledge base).

https://doi.org/10.31219/osf.io/r9p2m

**Open Mathematics Collaboration**

Op. J. Math. Phys.

Volume 3, Article 221, 2021 [IR]