Combining Texts

Ideas for 'Theory of Science (4 vols)', 'Anthropological Studies of Classification' and 'The Facts of Causation'

unexpand these ideas     |    start again     |     choose another area for these texts

display all the ideas for this combination of texts

---

1 idea

2. Reason / B. Laws of Thought / 1. Laws of Thought

7807	The laws of thought are true, but they are not the axioms of logic [Bolzano, by George/Van Evra]
	Full Idea: Bolzano said the 'laws of thought' (identity, contradiction, excluded middle) are true, but nothing of interest follows from them. Logic obeys them, but they are not logic's first principles or axioms.
	From: report of Bernard Bolzano (Theory of Science (Wissenschaftslehre, 4 vols) [1837], §3) by George / Van Evra - The Rise of Modern Logic
	A reaction: An interesting and crucial distinction. For samples of proposed axioms of logic, see Ideas 6408, 7798 and 7797.