Category Theory by Bartosz Milewski
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Reposting from Bartosz Milewski's YouTube channel, with cleaned-up audio. Reposted with permission. See Republishing Bartosz Milewski's Category Theory lectures. You can visit Bartosz Milewski's Programming Cafe or follow Bartosz Milewski on Twitter.

I’m cleaning audio and reposting (with permission) these amazing videos on Category Theory for Programmers by Bartosz Milewski.