Combining Texts

All the ideas for 'fragments/reports', 'works' and 'Occasions of Identity'

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10 ideas

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

11022

Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

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]

6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / g. Incompleteness of Arithmetic

10067

Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave]

9. Objects / B. Unity of Objects / 3. Unity Problems / b. Cat and its tail

13437

A CAR and its major PART can become identical, yet seem to have different properties [Gallois]

9. Objects / E. Objects over Time / 1. Objects over Time

16233

Gallois hoped to clarify identity through time, but seems to make talk of it impossible [Hawley on Gallois]

9. Objects / F. Identity among Objects / 3. Relative Identity

14755

Gallois is committed to identity with respect to times, and denial of simple identity [Gallois, by Sider]

9. Objects / F. Identity among Objects / 6. Identity between Objects

16231

Occasional Identity: two objects can be identical at one time, and different at others [Gallois, by Hawley]

23. Ethics / A. Egoism / 1. Ethical Egoism

3031	The greatest good is not the achievement of desire, but to desire what is proper [Menedemus, by Diog. Laertius]