11 ideas
22077 | Metaphysics is the lattice which makes incoming material intelligible [Hegel] |
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] |
10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
4581 | Virtues and vices are like secondary qualities in perception, found in observers, not objects [Hume] |
4580 | All virtues benefit either the public, or the individual who possesses them [Hume] |
21756 | All revolutions result from spirit changing its categories, to achieve a deeper understanding [Hegel] |
4579 | The idea of a final cause is very uncertain and unphilosophical [Hume] |
20705 | That events could be uncaused is absurd; I only say intuition and demonstration don't show this [Hume] |