We write[1] $x\lhd y$ for the element $\webleft [\webleft (y,x\webright )\webright ]$ of

\[ X\lhd Y\cong \left\lvert Y\right\rvert \odot X. \]

Footnotes

[1] Further Notation: Also written $x\lhd _{\mathsf{Sets}_{*}}y$.

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