Brendan Fong and David Spivak - Seven Sketches in Compositionality: An Invitation to Applied Category Theory

I just found this book on arXiv: https://arxiv.org/abs/1803.05316 posted on 12th Oct 2018. 

It was referenced in this blog post Matrix calculus for Milner's Bigraphs.

Here's a talk by Emily Riehl on the Yoneda Lemma in the Category of Matrices:


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