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All the ideas for 'Philosophy of Mathematics', 'Conditionals and Possibilia' and 'Heidegger: an introduction'

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7 ideas

1. Philosophy / H. Continental Philosophy / 3. Hermeneutics
Knowledge is not a static set of correct propositions, but a continuing search for better interpretations [Polt]
     Full Idea: Thanks to Heidegger, hermeneutics has gained wider acceptance - that knowledge is not a static set of correct propositions, but a continuing search for better interpretations.
     From: Richard Polt (Heidegger: an introduction [1999], 3.§7)
     A reaction: I am not sure if I understand the notion of a search that has a refusal to actually find anything as one of its basic principles.
2. Reason / D. Definition / 8. Impredicative Definition
Predicative definitions only refer to entities outside the defined collection [Horsten]
     Full Idea: Definitions are called 'predicative', and are considered sound, if they only refer to entities which exist independently from the defined collection.
     From: Leon Horsten (Philosophy of Mathematics [2007], §2.4)
5. Theory of Logic / J. Model Theory in Logic / 2. Isomorphisms
A theory is 'categorical' if it has just one model up to isomorphism [Horsten]
     Full Idea: If a theory has, up to isomorphism, exactly one model, then it is said to be 'categorical'.
     From: Leon Horsten (Philosophy of Mathematics [2007], §5.2)
6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics
Computer proofs don't provide explanations [Horsten]
     Full Idea: Mathematicians are uncomfortable with computerised proofs because a 'good' proof should do more than convince us that a certain statement is true. It should also explain why the statement in question holds.
     From: Leon Horsten (Philosophy of Mathematics [2007], §5.3)
6. Mathematics / B. Foundations for Mathematics / 6. Mathematics as Set Theory / a. Mathematics is set theory
The concept of 'ordinal number' is set-theoretic, not arithmetical [Horsten]
     Full Idea: The notion of an ordinal number is a set-theoretic, and hence non-arithmetical, concept.
     From: Leon Horsten (Philosophy of Mathematics [2007], §2.3)
10. Modality / B. Possibility / 1. Possibility
When we consider possibilities, there must be something we are considering [Polt]
     Full Idea: We would hardly want to say that a possibility is nothing, since surely we are considering something when we consider possibilities.
     From: Richard Polt (Heidegger: an introduction [1999], 1)
     A reaction: A nice contribution to the issue of whether modality is a feature of actuality. I would prefer to say that we can self-evidently utter truths and falsehoods about what is or is not possible, in nature, in logic, and maybe in metaphysics.
10. Modality / B. Possibility / 8. Conditionals / c. Truth-function conditionals
The truth-functional account of conditionals is right, if the antecedent is really acceptable [Jackson, by Edgington]
     Full Idea: Jackson defends the truth-functional account by saying that for a conditional to be assertable, it must not only be believed that its truth-conditions are satisfied, but the belief must be robust or resilient with respect to the antecedent.
     From: report of Frank Jackson (Conditionals and Possibilia [1981]) by Dorothy Edgington - Do Conditionals Have Truth Conditions? 4
     A reaction: ..That is, one would not abandon the conditional if one believed the antecedent to be true.