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“Good general theory does not search for the maximum generality, but for the right generality.”
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“If P is a presheaf on C and x E P(C), the value for an arrow f : D -* C in C is called the restriction of x along f, and is often denoted by I or by a dot:”
― Sheaves in Geometry and Logic: A First Introduction to Topos Theory
― Sheaves in Geometry and Logic: A First Introduction to Topos Theory
