21 ideas
9271 | Human knowledge may not produce well-being; the examined life may not be worth living [Gray] |
11022 | Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read] |
11065 | The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna] |
11023 | The logical connectives are 'defined' by their introduction rules [Gentzen] |
11213 | Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen] |
13832 | Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking] |
10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
18933 | Not-Being obviously doesn't exist, and the five modes of Being are all impossible [Gorgias, by Diog. Laertius] |
9275 | Knowledge does not need minds or nervous systems; it is found in all living things [Gray] |
9276 | The will hardly ever does anything; most of our life just happens to us [Gray] |
9866 | Gorgias says rhetoric is the best of arts, because it enslaves without using force [Gorgias, by Plato] |
5864 | Destroy seriousness with laughter, and laughter with seriousness [Gorgias] |
9278 | Nowadays we identify the free life with the good life [Gray] |
9280 | Over forty percent of the Earth's living tissue is human [Gray] |
23061 | Free atheism should start by questioning its faith in humanity [Gray] |
23057 | Gnosticism has a supreme creator God, giving way to a possibly hostile Demiurge [Gray] |
23056 | Judaism only became monotheistic around 550 BCE [Gray] |
9272 | Without Christianity we lose the idea that human history has a meaning [Gray] |
23055 | Christians introduced the idea that a religion needs a creed [Gray] |
9279 | What was our original sin, and how could Christ's suffering redeem it? [Gray] |
23058 | Buddhism has no divinity or souls, and the aim is to lose the illusion of a self [Gray] |