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Wolphram jonny
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Just a nice old man

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9
What set theoretical questions could never be answered by Turing machines of arbitrary cardinality?
Mar 10 '14
8
Can a Hamkins infinite time Turing Machine with infinite Super Turing jumps (from higher type oracles) get the power to decide $\Sigma_1^2$ sets?
Feb 8 '13
2
Would a non-constructible set become constructible if we had oracles of arbitrarily high cardinality for the halting problems of ordinal computers?
Mar 17 '14
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30
Doesn't a box holding a vacuum weigh the same as a box full of air?
28
Are there areas of mathematics (current or future) that cannot be formalized in set theory?
21
Can elements heavier than iron be present in a star's core?
19
Understanding the zero current in a simple circuit
18
How abruptly does the Doppler shift change sign?

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