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Hausdorff dimension, box dimension, packing dimension and similar concepts.

37 votes

What the heck is the Continuum Hypothesis doing in Weibel's Homological Algebra?

Since Tilemachos Vassias asked (in a comment to Mariano Suárez-Alvarez's answer) about "the appearance of set theory in seemingly random and completely unexpected places in mathematics," I'd like to g …
Andreas Blass's user avatar