Combining Philosophers

All the ideas for Engelbretsen,G/Sayward,C, Sarah Sawyer and Julio Cesare Vanini

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14 ideas

4. Formal Logic / A. Syllogistic Logic / 1. Aristotelian Logic

13913

The four 'perfect syllogisms' are called Barbara, Celarent, Darii and Ferio [Engelbretsen/Sayward]

13914

Syllogistic logic has one rule: what is affirmed/denied of wholes is affirmed/denied of their parts [Engelbretsen/Sayward]

4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic

13915

Syllogistic can't handle sentences with singular terms, or relational terms, or compound sentences [Engelbretsen/Sayward]

4. Formal Logic / A. Syllogistic Logic / 3. Term Logic

13916

Term logic uses expression letters and brackets, and '-' for negative terms, and '+' for compound terms [Engelbretsen/Sayward]

5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

13850

In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward]

5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

13849

Classical logic rests on truth and models, where constructivist logic rests on defence and refutation [Engelbretsen/Sayward]

5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic

13851

Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward]

5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names

18935

Semantic theory should specify when an act of naming is successful [Sawyer]

5. Theory of Logic / F. Referring in Logic / 1. Naming / c. Names as referential

18945

Millians say a name just means its object [Sawyer]

5. Theory of Logic / F. Referring in Logic / 1. Naming / e. Empty names

18934

Sentences with empty names can be understood, be co-referential, and even be true [Sawyer]

18938

Frege's compositional account of truth-vaues makes 'Pegasus doesn't exist' neither true nor false [Sawyer]

5. Theory of Logic / F. Referring in Logic / 2. Descriptions / c. Theory of definite descriptions

18947

Definites descriptions don't solve the empty names problem, because the properties may not exist [Sawyer]

5. Theory of Logic / K. Features of Logics / 5. Incompleteness

13852

Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward]

26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / b. Prime matter

16591

Prime matter is nothing but its parts [Vanini]