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14238
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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]
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Full Idea:
A class consists of objects; it is an aggregate, a collective unity, of them; if so, it must vanish when these objects vanish. If we burn down all the trees of a wood, we thereby burn down the wood. Thus there can be no empty class.
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From:
Gottlob Frege (Elucidation of some points in E.Schröder [1895], p.212), quoted by Oliver,A/Smiley,T - What are Sets and What are they For?
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A reaction:
This rests on Cantor's view of a set as a collection, rather than on Dedekind, which allows null and singleton sets.
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22236
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The big question of the Renaissance was how to govern everything, from the state to children [Foucault]
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Full Idea:
How to govern was one of the fundamental question of the fifteenth and sixteenth century. ...How to govern children, the poor and beggars, how to govern the family, a house, how to govern armies, different groups, cities, states, and govern one's self.
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From:
Michel Foucault (What is Critique? [1982], p.28), quoted by Johanna Oksala - How to Read Foucault 9
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A reaction:
A nice example of Foucault showing how things we take for granted (techniques of control) have been slowly learned, and then taught as standard. Of course, the Romans knew how to govern an army.
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