Combining Texts

All the ideas for 'The Aim and Structure of Physical Theory', 'Rules for the Direction of the Mind' and 'Symbolic Reasoning'

expand these ideas     |    start again     |     specify just one area for these texts

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4 ideas

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

21548

The null class is the class with all the non-existents as its members [MacColl, by Lackey]

11. Knowledge Aims / B. Certain Knowledge / 1. Certainty

9807	In pursuing truth, anything less certain than mathematics is a waste of time [Descartes]

14. Science / A. Basis of Science / 6. Falsification

22137

Observation can force rejection of some part of the initial set of claims [Duhem, by Boulter]

14. Science / B. Scientific Theories / 6. Theory Holism

18197

Experiments only test groups of hypotheses, and can't show which one is wrong [Duhem]