Combining Philosophers

All the ideas for Hilbert,D/Ackermann,W, Anaximenes and Michael Martin

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5 ideas

1. Philosophy / D. Nature of Philosophy / 5. Aims of Philosophy / e. Philosophy as reason

6855	Interesting philosophers hardly every give you explicitly valid arguments [Martin,M]

2. Reason / E. Argument / 1. Argument

6856	Valid arguments can be rejected by challenging the premises or presuppositions [Martin,M]

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

17750

The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

12. Knowledge Sources / B. Perception / 1. Perception

6857	An error theory of perception says our experience is not as it seems to be [Martin,M]

26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / c. Ultimate substances

1497	For Anaximenes nature is air, which takes different forms by rarefaction and condensation [Anaximenes, by Simplicius]