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38
“In a circle of 33, the next 10 people on my right are all liars”
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27
Why is a discrete topology called a discrete topology?
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17
Why is the fundamental group of the plane with two holes non-abelian?
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17
Example of a countable compact set in the real numbers
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16
Is $1+1 = 2$ true in any base?
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15
How do you minimize “hinge-loss”?
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12
Counting: how many ways of climbing a stair?
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12
Why is a strictly monotonic mapping between intervals continuous?
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12
Show that this ring has no identity.
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11
For which integers $a,b,c,d$ does $\frac{a}{b}+\frac{c}{d} = \frac{a+c}{b+d}$?
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11
In a Cayley table, which Group axioms fail when an entry appears twice in a row or a column?
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10
Average area of the shadow of a convex shape
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10
If I am 80% sure, is there an 80% chance that I'm right?
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9
Why is the empty set in the standard topology?
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9
Is it always possible to find 3 equidistant points on a closed loop?
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8
Sequentially continuous implies continuous
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8
Span of a subset of a vector space is the smallest subspace containing that set
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7
Create all numbers from 1-100 using 1,3,3,6
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7
Formal definition of “counterexample”.
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7
What is the probability that a red ball is chosen before the black ball?
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7
Flipping a set of unfair coins
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7
$\sin(\cos(\sin(\cos(\sin(\cos \cdots \sin(\cos x)))))))\cdots))))$
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6
Why is an uncountable union of null sets not necessarily a null set?
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6
Why Does the Definition of a Topology via Neighborhoods Include This Axiom
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6
What is it, intuitively, that makes a structure “topological”?
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6
Confusion about limit of log
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6
How do you differentiate a matrix equation with respect to a vector?
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6
Show that if $H$ is a subgroup of $S_n$, then either every member of $H$
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5
How can I formulate the 3-SAT problem as a 0-1 Linear integer program?
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5
Strange substitution in integral using partial fractions
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