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J. W. Tanner's user avatar
J. W. Tanner's user avatar
J. W. Tanner's user avatar
J. W. Tanner
  • Member for 5 years, 5 months
  • Last seen this week
  • Pennsylvania, USA
61 votes
Accepted

How deep is the liquid in a half-full hemisphere?

33 votes

How does the tribonacci sequence have anything to do with hyperbolic functions?

28 votes
Accepted

Prove that $2^{n}+1$ is not a cube of an integer for all $n\in\mathbb{N}$

23 votes
Accepted

$16!$ without calculator

18 votes
Accepted

Complex quadratic equation always comes out as wrong

18 votes

Why $(-2)^{2.5}$ isn't equal to $((-2)^{25})^{1/10}?\,$ [Fractional powers of negative numbers]

18 votes

Counting problem- Why is it wrong?

16 votes
Accepted

Prove that every integer n≥12 is the sum of two composites.

15 votes

Proving inequality for induction proof: $\frac1{(n+1)^2} + \frac1{n+1} < \frac1n$

14 votes

Choice of $q$ in Baby Rudin's Example 1.1

14 votes
Accepted

Proof that limits are unique

14 votes
Accepted

All integer solutions of $x^3-y^3=2020$.

13 votes
Accepted

Last 5 digits of factorial sum

13 votes

Where does this trigonometric substitution go wrong?

12 votes
Accepted

How many real roots does $x^4 - 4x^3 + 4x^2 - 10$ have?

12 votes

Definition of topological space & open sets

12 votes
Accepted

Arithmetic progression $(a,b,c)$ with $a^2+b^2=c^2$ and $\gcd(a,b,c) = 1$

11 votes

Prove that $x^2 + x +1 = y^2$ has no positive integer solutions

11 votes
Accepted

Divisibility by 7 Proof by Induction

11 votes
Accepted

Prove that $\sqrt[3]{2}+\sqrt[3]{4}$ is irrational

10 votes
Accepted

Closed sets in a cofinite topology

10 votes
Accepted

The solutions of $y'' = 2$ don't form a subspace

9 votes
Accepted

Integration simple question

9 votes

Why is $1007$ not prime, even though it can be represented as $6n\pm 1$?

9 votes

Proving $\det A = 1$

9 votes

$a^2-b^2=37$, evaluate $ a^2+b^2$

9 votes

Complex eigenvalues of a matrix in conjugate pairs (or not)

9 votes

Proving with the simplest method possible: $X^2+1 > X$

8 votes

Why do the digits of a number squared follow a similar quotient?

8 votes
Accepted

Solve the equation $|2x^2+x-1|=|x^2+4x+1|$

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