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116
What actually is a polynomial?
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70
What was the definition of "set" that resulted in Russell's paradox?
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49
Is there a *simple* example showing that uncorrelated random variables need not be independent?
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29
Why can't we prove consistency of ZFC like we can for PA?
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24
Any Simple Example of Lebesgue Integration?
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22
Why, historically, did Gödel think CH was false?
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21
Can there be an $\aleph_2$ or even greater?
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20
Is consistency an axiom of mathematics?
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20
Can someone please explain to me why cotangent graphs look the way they do?
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18
Examples of first-order claims about the reals that are not preserved under forcing
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18
Solve $(x-2)^6+(x-4)^6=64$ using a substitution.
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18
Probability of a Full House for five-card hand.
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18
Where is the mistake in this "proof" of the inconsistency of ZFC?
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18
If the order in a set doesn’t matter, can we change order of, say, $\Bbb{N}$?
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17
Infinite zeros in infinite series
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17
Why does the distance between two members of a metric space map to a real number?
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16
Riemann hypothesis, random walks and Möbius function
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16
What exactly is a Non Integrable function? How can they be solved?
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16
How to reconcile Jech's different definitions of cardinal numbers?
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15
How to show $(a + b)^n \leq a^n + b^n$, where $a, b \geq 0$ and $n \in (0, 1]$?
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14
Why $\frac{1}{2\pi}\int_{-\infty}^{\infty}e^{iw(t-x)}dw$ is the Dirac delta function?
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14
Variance of a sum of IID random variables.
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13
Is Fermat's Last Theorem really proven by Prof. Wiles?
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13
Can we "complete" the standard binary tree to have a "level at infinity"?
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13
Why is this inference invalid?
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13
How to "fix" $\int_{-1}^1 \frac {dx}{x^2}$ with complex numbers?
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13
Improper integral of natural log over a quadratic
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13
What is the definition of belonging in axiomatic set theory?
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13
How do you convince someone that parallel lines can touch/meet?
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12
Is zero to the power of an imaginary number still zero?
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