Combining Texts

All the ideas for 'Purifications (frags)', 'works' and 'Elucidation of some points in E.Schrder'

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2 ideas

1. Philosophy / A. Wisdom / 2. Wise People

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Tell cleverness from answers, but wisdom from questions [Mahfouz]

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

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A class is an aggregate of objects; if you destroy them, you destroy the class; there is no empty class [Frege]