I wrote a small introduction to the mathematical idea of proving theorems by contradiction. Let me know what you think rakhim.org/2018/09/a-simple-in

Finally moved from Gmail to Fastmail for personal mail. It's wonderful, and all 3rd party clients work properly (unlike with gmail's weird custom IMAP).

Really hoping to ditch Chrome too, but Firefox for Mac with retina displays is too sluggish...

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