家庭场景中的“天工”机器人。受供者供图
As a postscript, we ought to ask if the same reasoning applies to rationals; if it does, that would contradict our earlier argument that rational numbers can only have a handful of 2-good solutions. To show that there is no contradiction, note that in the rational case, s can conceivably reach zero (i.e., a / b can be an exact approximation). Next, rewrite r as p / q in the left-hand portion of the earlier inequality:
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From a privacy perspective, the problem is that Alice will need to present her credential every time she wants to access that Resource. For example, each time she visits Wikipedia, she’ll need to hand over a credential that is tied to her real-world identity. A curious website (or an advertising network) can use this to precisely link her browsing history on the site to an actual human in the world. To a certain extent, this is the world we already live in today: advertising companies probably know a lot about who we are and what we’re browsing. What’s about to change in our future is that these online identities will increasingly be bound to our real-world government identity, so no more “Anonymous-User-38.”
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