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# Questions

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863
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### Where in ordinary math do we need unbounded separation and replacement?

mar 6 at 9:22 Adam Epstein 946212

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### What to call substructures in universal algebra in which we restrict the signature?

may 3 12 at 22:28 Joel David Hamkins 74.9k7187343

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### Why is the cardinality of the codomain of a ring epimorphism at most the cardinality of the domain?

nov 1 11 at 22:06 Boris Novikov 1,346139

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### Are limits and colimits in the category of etale maps computed fiber-wise?

dec 3 11 at 4:02 Benjamin Steinberg 10.6k11449

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### How to calculate the Feigenbaum constant to high precision?

apr 30 11 at 15:34 Jeremy Kahn 30615

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### Is the decomposition of an algebra into irreducible components essentially unique?

dec 12 10 at 0:42 William DeMeo 576310

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### Algorithms for finding rational points on an elliptic curve?

feb 9 at 7:28 Barış Can Tayiz 12

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