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Top Questions
10 votes

Jacobian of (f,g) is identically zero if and only if f = h ∘ g?

derivatives vector-analysis jacobian asked Jun 21 '17 at 6:55
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9 votes

Finite group of “linear substitutions”

linear-algebra group-theory differential-equations linear-transformations asked Jun 18 '17 at 19:33
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8 votes

Finding the image in an elliptic mirror

geometry conic-sections asked Jun 24 '19 at 7:19
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7 votes

Optimal way to stack deck against uniformly random opponent?

probability game-theory card-games asked Feb 25 '19 at 4:53
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6 votes

References on Tolkien's plots

reference-request asked May 28 '19 at 19:39
mythology.stackexchange.com

6 votes

How many total orders consistent with a partial order?

combinatorics measure-theory order-theory asked Aug 5 '17 at 20:54
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6 votes

All smooth real functions are related by coordinate change?

multivariable-calculus jacobian asked Oct 27 '17 at 17:59
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5 votes

A regular connected graph has k loops?

matrices graph-theory algebraic-graph-theory asked Nov 12 '17 at 20:28
math.stackexchange.com

5 votes

Finding an order-2 permutation that sorts colored balls

permutations modular-arithmetic coloring sorting asked Mar 18 '18 at 19:00
math.stackexchange.com

5 votes

How to define pivot columns?

linear-algebra category-theory linear-transformations systems-of-equations gaussian-elimination asked May 17 '19 at 2:23
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Top Answers
38
“In a circle of 33, the next 10 people on my right are all liars”
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24
Why is a discrete topology called a discrete topology?
math.stackexchange.com

17
Example of a countable compact set in the real numbers
math.stackexchange.com

16
Is $1+1 = 2$ true in any base?
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13
Why is the fundamental group of the plane with two holes non-abelian?
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12
Show that this ring has no identity.
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12
How do you minimize “hinge-loss”?
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12
Counting: how many ways of climbing a stair?
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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
Why is a strictly monotonic mapping between intervals continuous?
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10
If I am 80% sure, is there an 80% chance that I'm right?
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9
Is it always possible to find 3 equidistant points on a closed loop?
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9
In a Cayley table, which Group axioms fail when an entry appears twice in a row or a column?
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9
Why is the empty set in the standard topology?
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8
Span of a subset of a vector space is the smallest subspace containing that set
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8
Average area of the shadow of a convex shape
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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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7
What is the probability that a red ball is chosen before the black ball?
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7
Formal definition of “counterexample”.
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7
Create all numbers from 1-100 using 1,3,3,6
puzzling.stackexchange.com

6
Sequentially continuous implies continuous
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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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5
Strange substitution in integral using partial fractions
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5
Why Does the Definition of a Topology via Neighborhoods Include This Axiom
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5
$P(X)$ with symmetric difference as addition as a vector space over $\mathbb{Z}_2$
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5
Can someone show me how to solve $2^x + x = 4$?
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5
Why is an uncountable union of null sets not necessarily a null set?
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5
Optimal way to stack deck against uniformly random opponent?
math.stackexchange.com

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