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JMoravitz
  • Member for 7 years, 10 months
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44 votes

Why is $\{\{1\}\}$ not equal to $\{1,\{1\}\}$?

39 votes
Accepted

Why does $3^{16} \times 7^{-6}$ become $\frac{3^{16}} {7^{6}}$?

36 votes
Accepted

Perfect square all 9's

30 votes

Can a relation be both symmetric and antisymmetric; or neither?

29 votes
Accepted

Weakly Connected Graphs

29 votes
Accepted

Expected value of the number of flips until the first head

28 votes
Accepted

How to compose two functions?

27 votes

Is $n^7 - 77$ ever a Fibonacci number?

26 votes
Accepted

Two players placing coins on a round table with the goal of making the last move

24 votes
Accepted

What is the Scientific Notation of Zero?

23 votes
Accepted

Why aren't these two solutions equivalent? Combinatorics problem

23 votes
Accepted

Smallest number such that the sum of digits and the product of digits is $2000$

21 votes
Accepted

Calculating Eigenvectors: Is my book wrong?

21 votes
Accepted

How many points uniquely define a square?

20 votes
Accepted

Counter-example for misused theorem in series convergence test

20 votes

What is the cardinality of the set of the empty set?

17 votes

How many 7-note musical scales are possible within the 12-note system?

17 votes
Accepted

Roman Numbers - Conversion to decimal number

17 votes

Why aren't these negative numbers solutions for radical equations?

17 votes
Accepted

What is the difference between a loop, cycle and strongly connected components in Graph Theory?

16 votes

difference between nonpositive and negative numbers?

16 votes

Computing the determinant of a large matrix?

16 votes
Accepted

What is special about square numbers here?

15 votes
Accepted

Prove there always exists a partition such that vertices in each part have even degree

15 votes
Accepted

Why cannot $(2x^2 + x)^2$ be simplified to $2x^4 + x^2$?

14 votes
Accepted

A simple mathematical expression for the periodic sequence $(1, -2, -1, 2, 1, -2, -1, 2,\dots)$

14 votes

Can infinity be divided by anything?

13 votes

Combination and permutation of indistinguishable objects

12 votes
Accepted

What came first, the $\forall$ or the $\exists$?

12 votes
Accepted

Numbers for which $n!=n^n$

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