There's a Principia Mathematica anniversary symposium at Trinity College, Cambri... | Hacker News

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		ionfish on Nov 26, 2010 \| parent \| context \| favorite \| on: Stephan Wolfram: 100 Years Since Principia Mathema... There's a Principia Mathematica anniversary symposium at Trinity College, Cambridge this weekend. http://www.srcf.ucam.org/principia/

pbhjpbhj on Nov 26, 2010 [–]

Sorry I miss clicked and downvoted you instead of upvoting; the interface prevents me from rectifying this error.

oiuyhgfthyujik on Nov 26, 2010 | [–]

So does -1 + 1 = 0 here?

Is there some book that proves this?

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