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collatz-conjecture

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33

What's the closest approximation to $\pi$ using the digits $0-9$ only once?

Jan 3, 2018

12

Must a sequence be well-founded?

Sep 19, 2018

11

Write Occam's razor rigorously

Jul 28, 2017

9

What's $-\frac{1}{27}$ in the p-adic ring $\Bbb Z_2$?

Oct 11, 2019

7

Show $f(x)=1-\frac{1}{x\left(\lvert x\rvert_2\right)}$ converges on $0$ in finite steps

Mar 10, 2017

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40

Simple theorems that are instances of deep mathematics

Apr 6, 2017

20

Does multiplying all a number's roots together give a product of infinity?

Jul 13, 2016

18

How can I get faster at doing math?

Jul 19

16

Is "you know everything" the (using sentential logic) logical negation of "you know nothing"?

Aug 5, 2016

10

Verify my understanding of a math joke.

Aug 12, 2016

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+10

What is the sum of the 2-adic values of the orbits of the affine group over 2-adic integers restricted to $ax+b$ where $2^{\nu_2(x)}=2^{\nu_2(b)}$?

-8

Are all the inner automorphisms of the linear polynomials over 2-adic units, isometric?

+18

What's the automorphism group of $ax-b\cdot2^{\nu_2(x)}: a,b\in\Bbb Z_2^\times$ on $\Bbb Q_2$?

-2

Is there a standard definition for an *Ultrafilter on a set* which describes an orbit of a function on a set?

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