Ideas of Robert Hanna, by Theme

[American, fl. 2006, Professor at the University of Colorado, Boulder.]

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1. Philosophy / F. Analytic Philosophy / 1. Analysis
Frege's logical approach dominates the analytical tradition
1. Philosophy / G. Scientific Philosophy / 3. Scientism
Scientism says most knowledge comes from the exact sciences
2. Reason / F. Fallacies / 1. Fallacy
'Affirming the consequent' fallacy: φ→ψ, ψ, so φ
'Denying the antecedent' fallacy: φ→ψ, ¬φ, so ¬ψ
We can list at least fourteen informal fallacies
2. Reason / F. Fallacies / 4. Circularity
Circular arguments are formally valid, though informally inadmissible
2. Reason / F. Fallacies / 5. Fallacy of Composition
Formally, composition and division fallacies occur in mereology
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
Logic is explanatorily and ontologically dependent on rational animals
Logic is personal and variable, but it has a universal core
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
Intensional consequence is based on the content of the concepts
6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Number / g. Incompleteness of Arithmetic
Gödel's Second says that semantic consequence outruns provability
6. Mathematics / C. Sources of Mathematics / 6. Logicism / d. Logicism critique
Logicism struggles because there is no decent theory of analyticity
7. Existence / C. Structure of Existence / 5. Supervenience / b. Types of supervenience
Supervenience can add covariation, upward dependence, and nomological connection
10. Modality / A. Necessity / 2. Nature of Necessity
A sentence is necessary if it is true in a set of worlds, and nonfalse in the other worlds
10. Modality / A. Necessity / 5. Metaphysical Necessity
Metaphysical necessity can be 'weak' (same as logical) and 'strong' (based on essences)
10. Modality / A. Necessity / 6. Logical Necessity
Logical necessity is truth in all logically possible worlds, because of laws and concepts
10. Modality / A. Necessity / 7. Natural Necessity
Nomological necessity is truth in all logically possible worlds with our laws
12. Knowledge Sources / E. Direct Knowledge / 1. Intuition
Intuition is only outside the 'space of reasons' if all reasons are inferential
Intuition includes apriority, clarity, modality, authority, fallibility and no inferences
Intuition is more like memory, imagination or understanding, than like perception
14. Science / D. Explanation / 2. Types of Explanation / i. Explanations by reduction
Explanatory reduction is stronger than ontological reduction
15. Nature of Minds / C. Capacities of Minds / 2. Imagination
Imagination grasps abstracta, generates images, and has its own correctness conditions
18. Thought / A. Modes of Thought / 1. Thought
Should we take the 'depictivist' or the 'descriptivist/propositionalist' view of mental imagery?
18. Thought / A. Modes of Thought / 6. Rationality
Humean Instrumental rationality is the capacity to seek contingent truths
Kantian principled rationality is recognition of a priori universal truths
Hegelian holistic rationality is the capacity to seek coherence
Rational animals have a normative concept of necessity
One tradition says talking is the essence of rationality; the other says the essence is logic
18. Thought / B. Mechanics of Thought / 1. Psychology
Most psychologists are now cognitivists