Ideas from 'Paradoxes of the Infinite' by Bernard Bolzano [1846], by Theme Structure
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
9987

An aggregate in which order does not matter I call a 'set'

6. Mathematics / A. Nature of Mathematics / 5. The Infinite / a. The Infinite
10856

A truly infinite quantity does not need to be a variable
