Combining Texts

Ideas for 'Croce and Collingwood', 'Logic in Mathematics' and 'Fourfold Root of Princ of Sufficient Reason'

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4 ideas

2. Reason / B. Laws of Thought / 2. Sufficient Reason

21918

Sufficient Reason can't be proved, because all proof presupposes it [Schopenhauer, by Lewis,PB]

2. Reason / D. Definition / 3. Types of Definition

16877

A 'constructive' (as opposed to 'analytic') definition creates a new sign [Frege]

2. Reason / D. Definition / 10. Stipulative Definition

11219

Frege suggested that mathematics should only accept stipulative definitions [Frege, by Gupta]

2. Reason / E. Argument / 6. Conclusive Proof

16878

We must be clear about every premise and every law used in a proof [Frege]