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Farewell
  • Member for 6 years, 8 months
  • Last seen more than 5 years ago
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125 votes

Are there an infinite number of prime numbers where removing any number of digits leaves a prime?

13 votes
Accepted

Why not define infinite derivatives?

4 votes
Accepted

Why $\int \limits _0 ^1 \log x \Bbb d x \ne \int \limits _0 ^{2 \pi} \log \sin x \Bbb d x$?

4 votes

The staircase paradox, or why $\pi\ne4$

4 votes

There is no square number that is $3 \mod 4$

4 votes

List objects that are not what they are called

3 votes

How did early mathematicians make it without Set theory?

3 votes
Accepted

discontinuous solutions of the functional equation $f\left(a^b\right) = f(a)^{f(b)}$

3 votes

Let $a,b,x,y\in \mathbb{Z}$, with $ax-by=1$. How to prove that $gcd(a+b,x+y)=1$?

3 votes

Find remainder when $1^{5} + 2^{5} \cdots +100^{5}$ divided by 4

3 votes
Accepted

Can I prove a multivariable limit like this?

2 votes
Accepted

Does $f(x) = |x|$ have a local minimum?

2 votes

Prove that $e^{2x+1}+e^{x}+1/4$ is always greater than 0

2 votes

The problem of instant velocity

2 votes

Inverse Limit of set

2 votes

How to find the formula of a function from its graph?

2 votes

Which general physical transformation to the number space does exponentiation represent?

2 votes
Accepted

Help Solving Fraction Math Question

2 votes
Accepted

Why do mathematicans care so much about the incompressible Navier-Stokes equations?

1 vote

If $q^{n+1}$ doesn't converge, then why $\frac{1-q^{n+1}}{1-q}$ doesn't converge either?

1 vote

Prove that for all primes p: $φ(p^i)$= $p^i$ - $p^{i-1}$

1 vote

Can $x^{p/q}$ be rigorously proven/disproven to be extended to a larger subset of reals that includes negative real numbers?

1 vote

If $p$ and $q$ are positive prime numbers such that $p$ is divisible by $q$, show that $p = q$.

1 vote
Accepted

Difficulties on proving the continuity part of a homeomorphism

1 vote

Trying to prove a function is integrable

1 vote

What's problematic about finding out if a large number is Prime or not?

1 vote

Are these metrics?

1 vote

Harmonic Series Paradox

1 vote
Accepted

How to know if function is a polynomial?

1 vote

Computing Riemann integral (if you know the integral of a similar function)