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Answers
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173
What are some reasonable-sounding statements that are independent of ZFC? (4)
95
What are the most misleading alternate definitions in taught mathematics?
92
What are the most attractive Turing undecidable problems in mathematics? (3)
90
Examples of common false beliefs in mathematics. (2)
80
Where to buy premium white chalk in the U.S., like they have at RIMS?
75
Reductio ad absurdum or the contrapositive?
73
Is the analysis as taught in universities in fact the analysis of definable numbers?
72
Theorems with unexpected conclusions
68
Which mathematical ideas have done most to change history?
59
Value of “of course” in the mathematical literature
57
Solutions to the Continuum Hypothesis
56
Most ‘unintuitive’ application of the Axiom of Choice?
56
nontrivial theorems with trivial proofs (2)
46
Why worry about the axiom of choice?
46
A remark of Connes
43
Theorems true but wrong.
41
Jokes in the sense of Littlewood: examples?
38
Can a problem be simultaneously polynomial time and undecidable?
35
Cardinality: Why is there no “ℵ½”?
35
How has “what every mathematician should know” changed?
35
Strong induction without a base case (3)
32
How far is Lindelöf from compactness?
32
The phenomena of eventual counterexamples
31
How helpful is non-standard analysis?
31
Knuth’s intuition that Goldbach might be unprovable
30
In set theories where Continuum Hypothesis is false, what are the new sets?
30
Proofs of the uncountability of the reals.
29
Awfully sophisticated proof for simple facts
29
What are the most elegant proofs that you have learned from MO?
28
What’s wrong with the surreals?
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