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42 votes

Simple theorems that are instances of deep mathematics

answered Apr 6, 2017 at 8:12

21 votes

How can I get faster at doing math?

answered Jul 19, 2023 at 11:08

20 votes

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

answered Jul 13, 2016 at 17:13

16 votes

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

answered Aug 5, 2016 at 14:19

10 votes

Accepted

Verify my understanding of a math joke.

answered Aug 12, 2016 at 16:47

10 votes

In how many ways can we roll a red die, a yellow die, and a black die, and get a sum of $9$?

answered Feb 8, 2017 at 19:36

9 votes

How could the Collatz conjecture possibly be undecidable?

answered Mar 12, 2017 at 20:22

8 votes

Why do we divide values to count permutations with repeated letters?

answered Jul 15, 2016 at 11:05

8 votes

Consequences of Collatz Conjecture being true

answered May 28, 2016 at 10:21

7 votes

Some details about 'Collatz Conjecture'?

answered Mar 28, 2018 at 21:37

6 votes

What are the names of numbers in the binary system?

answered May 2, 2017 at 11:45

5 votes

Are there any partial proofs for the collatz conjecture?

answered Jun 7, 2018 at 14:03

5 votes

What does $|a| = |b|$ is equal to?

answered Jan 14, 2018 at 17:07

4 votes

Accepted

What is the sum of number of digits of the numbers $2^{2001}$ and $5^{2001}$

answered Mar 15, 2021 at 18:07

3 votes

Accepted

Why must the rational numbers be fixed on any automorphism of $\mathbb R$?

answered Oct 20, 2023 at 11:17

3 votes

Accepted

Having at least one row of zeros on $5\times5$ board

answered Nov 1, 2018 at 14:30

3 votes

In the Collatz conjecture, why are $\max(\textrm{collatz}(n))$ and $\textrm{var}(\textrm{collatz}(n))$ so closely related?

answered May 20, 2017 at 21:07

3 votes

Accepted

Biggest factor of 2 of any number N

answered Mar 17, 2017 at 18:34

3 votes

What is the origin of the term "modular" in different areas?

answered Mar 17, 2017 at 19:11

3 votes

Accepted

Find time, when angle between the minute and hour hands are given

answered Mar 1, 2017 at 18:53

3 votes

Explaining the meaning of equality

answered Jun 29, 2018 at 18:41

3 votes

What are some counter-intuitive results in mathematics that involve only finite objects?

answered Mar 4, 2019 at 13:57

3 votes

Why does $a\cdot r^{-1}$ equate to $\frac {a}{r} = 1$?

answered Jul 20, 2016 at 14:12

3 votes

Proving the Riemann Hypothesis and Impact on Cryptography

answered Jun 7, 2016 at 10:27

3 votes

Number of moves necessary to solve Rubik's cube by pure chance

answered May 22, 2016 at 10:25

3 votes

Is the function $f(x) = x^2 - 2x$ one-to-one?

answered May 19, 2016 at 11:29

3 votes

How many integers $\leq N$ are divisible by $2,3$ but not divisible by their powers?

answered Jul 14, 2016 at 11:58

3 votes

Accepted

Evaluate the angle x in terms of angles and y and z?

answered Jul 15, 2016 at 13:40

3 votes

What is the correct definition of a group?

answered Jul 18, 2016 at 10:49

3 votes

Accepted

Calculus 1 - Optimization word problem minimize the distance

answered Jul 2, 2016 at 8:27

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222 Answers

Simple theorems that are instances of deep mathematics

How can I get faster at doing math?

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

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

Verify my understanding of a math joke.

In how many ways can we roll a red die, a yellow die, and a black die, and get a sum of $9$?

How could the Collatz conjecture possibly be undecidable?

Why do we divide values to count permutations with repeated letters?

Consequences of Collatz Conjecture being true

Some details about 'Collatz Conjecture'?

What are the names of numbers in the binary system?

Are there any partial proofs for the collatz conjecture?

What does $|a| = |b|$ is equal to?

What is the sum of number of digits of the numbers $2^{2001}$ and $5^{2001}$

Why must the rational numbers be fixed on any automorphism of $\mathbb R$?

Having at least one row of zeros on $5\times5$ board

In the Collatz conjecture, why are $\max(\textrm{collatz}(n))$ and $\textrm{var}(\textrm{collatz}(n))$ so closely related?

Biggest factor of 2 of any number N

What is the origin of the term "modular" in different areas?

Find time, when angle between the minute and hour hands are given

Explaining the meaning of equality

What are some counter-intuitive results in mathematics that involve only finite objects?

Why does $a\cdot r^{-1}$ equate to $\frac {a}{r} = 1$?

Proving the Riemann Hypothesis and Impact on Cryptography

Number of moves necessary to solve Rubik's cube by pure chance

Is the function $f(x) = x^2 - 2x$ one-to-one?

How many integers $\leq N$ are divisible by $2,3$ but not divisible by their powers?

Evaluate the angle x in terms of angles and y and z?

What is the correct definition of a group?

Calculus 1 - Optimization word problem minimize the distance