昨日阅读3 h,累计 758 h
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《思想的力量:哲学导论》
494. 上帝和逻辑实证主义
(logical positivism),即维也纳学派(Vienna Circle)
核心思想:可证实原则(verifiability principle)。
分析性命题(analytic proposition):你比任何一个比你年幼的人都要年长。这一类的命题根据定义就可以辨别真伪,无须经验。
495. 宇宙大爆炸:现在大多数科学家接受了宇宙大爆炸(Big Bang)的观点
宇宙大爆炸的理论正确的话,就要求科学家们在一个不可解释的宇宙和一个可解释的非物理存在之间作出艰难的抉择。
496. 逻辑实证主义者认为形而上学、认识论和伦理学领域提出的不计其数的哲学观点既不属于分析性命题,又无法证实,实际上都是没有意义的。都也许表达某些情绪,但都谈不上真伪。维也纳学派最有名的成员之一鲁道夫-卡尔纳普(Rudolph Carnap,1891-1970)甚至宣称:我们否认一切哲学问题,不管它属于形而上学、伦理学还是认识论。
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Blockchain:
Principles of security
Cryptography safeguards the three principles of information security, which can be remembered by the mnemonic device Central Intelligence Agency (CIA):
- Confidentiality: Ensures that information is shared with the appropriate parties and that sensitive information (for example, medical information,some financial data) is shared exclusively with the consent of appropriate parties.
- Integrity: Ensures that only authorized parties can change data and (depending on the application) that the changes made do not threaten the accuracy or authenticity of the data. This principle is arguably the most relevant to blockchains in general, and especially the public blockchains.
- Availability: Ensures authorized users (for example, holders of tokens) have the use of data or resources when they need or want them. The distributed and decentralized nature of blockchain helps with this greatly.
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昨日阅读3 h
累计 758 h