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when toggle format what by license comment
Apr 22, 2021 at 15:27 answer added Benjamin Steinberg timeline score: 3
Apr 22, 2021 at 15:15 comment added Benjamin Steinberg It's called the power problem and if you Google undecidability of the power problem you will find a reference to either McCool of Collins I believe. I forget which.
Apr 22, 2021 at 15:08 comment added Benjamin Steinberg This has been answered on previous MO questions
Apr 22, 2021 at 14:32 history asked user178109 CC BY-SA 4.0