Author: J-B Vienney Format: MarkdownItexCopy-pasted the very explicit definition added to the page "monoidal category".
<a href="https://ncatlab.org/nlab/revision/diff/strict+monoidal+category/7">diff</a>, <a href="https://ncatlab.org/nlab/revision/strict+monoidal+category/7">v7</a>, <a href="https://ncatlab.org/nlab/show/strict+monoidal+category">current</a>
Copy-pasted the very explicit definition added to the page “monoidal category”.