78 ideas
13466 | We are all post-Kantians, because he set the current agenda for philosophy [Hart,WD] |
7846 | Nietzsche thinks philosophy makes us more profound, but not better [Nietzsche, by Ansell Pearson] |
13477 | The problems are the monuments of philosophy [Hart,WD] |
20107 | How many mediocre thinkers are occupied with influential problems! [Nietzsche] |
2546 | Philosophy is a magnificent failure in its attempt to overstep the limits of our knowledge [McGinn] |
20352 | Nietzsche has a metaphysics, as well as perspectives - the ontology is the perspectives [Nietzsche, by Richardson] |
13515 | To study abstract problems, some knowledge of set theory is essential [Hart,WD] |
20379 | Reason is just another organic drive, developing late, and fighting for equality [Nietzsche] |
13469 | Tarski showed how we could have a correspondence theory of truth, without using 'facts' [Hart,WD] |
13504 | Truth for sentences is satisfaction of formulae; for sentences, either all sequences satisfy it (true) or none do [Hart,WD] |
13503 | A first-order language has an infinity of T-sentences, which cannot add up to a definition of truth [Hart,WD] |
13500 | Conditional Proof: infer a conditional, if the consequent can be deduced from the antecedent [Hart,WD] |
13502 | ∃y... is read as 'There exists an individual, call it y, such that...', and not 'There exists a y such that...' [Hart,WD] |
13456 | Set theory articulates the concept of order (through relations) [Hart,WD] |
13497 | Nowadays ZFC and NBG are the set theories; types are dead, and NF is only useful for the whole universe [Hart,WD] |
13443 | ∈ relates across layers, while ⊆ relates within layers [Hart,WD] |
13442 | Without the empty set we could not form a∩b without checking that a and b meet [Hart,WD] |
13493 | In the modern view, foundation is the heart of the way to do set theory [Hart,WD] |
13495 | Foundation Axiom: an nonempty set has a member disjoint from it [Hart,WD] |
13461 | We can choose from finite and evident sets, but not from infinite opaque ones [Hart,WD] |
13462 | With the Axiom of Choice every set can be well-ordered [Hart,WD] |
13516 | If we accept that V=L, it seems to settle all the open questions of set theory [Hart,WD] |
13441 | Naïve set theory has trouble with comprehension, the claim that every predicate has an extension [Hart,WD] |
13494 | The iterative conception may not be necessary, and may have fixed points or infinitely descending chains [Hart,WD] |
13457 | A 'partial ordering' is irreflexive and transitive; the sets are ordered, but not the subsets [Hart,WD] |
13490 | Von Neumann defines α<β as α∈β [Hart,WD] |
13458 | A partial ordering becomes 'total' if any two members of its field are comparable [Hart,WD] |
13460 | 'Well-ordering' must have a least member, so it does the natural numbers but not the integers [Hart,WD] |
13481 | Maybe sets should be rethought in terms of the even more basic categories [Hart,WD] |
2544 | Thoughts have a dual aspect: as they seem to introspection, and their underlying logical reality [McGinn] |
13506 | The universal quantifier can't really mean 'all', because there is no universal set [Hart,WD] |
13505 | Model theory studies how set theory can model sets of sentences [Hart,WD] |
13511 | Model theory is mostly confined to first-order theories [Hart,WD] |
13513 | Models are ways the world might be from a first-order point of view [Hart,WD] |
13512 | Modern model theory begins with the proof of Los's Conjecture in 1962 [Hart,WD] |
13496 | First-order logic is 'compact': consequences of a set are consequences of a finite subset [Hart,WD] |
13484 | Berry's Paradox: we succeed in referring to a number, with a term which says we can't do that [Hart,WD] |
13482 | The Burali-Forti paradox is a crisis for Cantor's ordinals [Hart,WD] |
13507 | The machinery used to solve the Liar can be rejigged to produce a new Liar [Hart,WD] |
13492 | Von Neumann's ordinals generalise into the transfinite better, because Zermelo's ω is a singleton [Hart,WD] |
13459 | The less-than relation < well-orders, and partially orders, and totally orders the ordinal numbers [Hart,WD] |
13463 | There are at least as many infinite cardinals as transfinite ordinals (because they will map) [Hart,WD] |
13491 | The axiom of infinity with separation gives a least limit ordinal ω [Hart,WD] |
13446 | 19th century arithmetization of analysis isolated the real numbers from geometry [Hart,WD] |
13509 | We can establish truths about infinite numbers by means of induction [Hart,WD] |
13474 | Euclid has a unique parallel, spherical geometry has none, and saddle geometry has several [Hart,WD] |
13471 | Mathematics makes existence claims, but philosophers usually say those are never analytic [Hart,WD] |
13488 | Mass words do not have plurals, or numerical adjectives, or use 'fewer' [Hart,WD] |
20123 | First see nature as non-human, then fit ourselves into this view of nature [Nietzsche] |
20105 | Storms are wonderful expressions of free powers! [Nietzsche] |
20376 | We begin with concepts of kinds, from individuals; but that is not the essence of individuals [Nietzsche] |
13480 | Fregean self-evidence is an intrinsic property of basic truths, rules and definitions [Hart,WD] |
13476 | The failure of key assumptions in geometry, mereology and set theory throw doubt on the a priori [Hart,WD] |
2539 | Mental modules for language, social, action, theory, space, emotion [McGinn] |
2545 | Free will is mental causation in action [McGinn] |
2543 | Brains aren't made of anything special, suggesting panpsychism [McGinn] |
2540 | Examining mind sees no brain; examining brain sees no mind [McGinn] |
13475 | The Fregean concept of GREEN is a function assigning true to green things, and false to the rest [Hart,WD] |
2547 | There is information if there are symbols which refer, and which can combine into a truth or falsehood [McGinn] |
22501 | Nietzsche classified actions by the nature of the agent, not the nature of the act [Nietzsche, by Foot] |
22500 | Nietzsche failed to see that moral actions can be voluntary without free will [Foot on Nietzsche] |
20128 | Each person has a fixed constitution, which makes them a particular type of person [Nietzsche, by Leiter] |
22503 | Nietzsche could only revalue human values for a different species [Nietzsche, by Foot] |
8041 | The superman is a monstrous oddity, not a serious idea [MacIntyre on Nietzsche] |
20135 | Nietzsche's higher type of man is much more important than the idealised 'superman' [Nietzsche, by Leiter] |
20353 | The 'will to power' is basically applied to drives and forces, not to people [Nietzsche, by Richardson] |
20113 | Friendly chats undermine my philosophy; wanting to be right at the expense of love is folly [Nietzsche] |
22475 | Moral generalisation is wrong, because we should evaluate individual acts [Nietzsche, by Foot] |
22476 | Nietzsche thought our psychology means there can't be universal human virtues [Nietzsche, by Foot] |
20104 | Nietzsche tried to lead a thought-provoking life [Safranski on Nietzsche] |
7847 | Initially nihilism was cosmic, but later Nietzsche saw it as a cultural matter [Nietzsche, by Ansell Pearson] |
9782 | Nietzsche urges that nihilism be active, and will nothing itself [Nietzsche, by Zizek] |
20102 | Flight from boredom leads to art [Nietzsche] |
20106 | Nietzsche was fascinated by a will that can turn against itself [Nietzsche, by Safranski] |
20367 | Individual development is more important than the state, but a community is necessary [Nietzsche] |
20371 | Nietzsche thinks we should join a society, in order to criticise, heal and renew it [Nietzsche, by Richardson] |
20108 | Every culture loses its identity and power if it lacks a major myth [Nietzsche] |
2542 | Causation in the material world is energy-transfer, of motion, electricity or gravity [McGinn] |