User Misha Lavrov

119 votes

Accepted

A multiplication algorithm found in a book by Paul Erdős: how does it work?

answered Mar 17, 2017 at 4:38

110 votes

What's new in higher dimensions?

geometry soft-question manifolds big-list visualization

answered Feb 11, 2018 at 1:53

93 votes

How can I justify this without determining the determinant?

linear-algebra determinant

answered Nov 25, 2019 at 3:29

61 votes

Accepted

Choosing office hours to maximise number of students who can attend at least one time slot

combinatorics optimization

answered Sep 10, 2018 at 18:26

59 votes

Accepted

Fallacious proof involving trigonometry

calculus trigonometry proof-explanation fake-proofs trigonometric-integrals

answered Nov 16, 2017 at 15:39

54 votes

Accepted

Is this graph a planar graph or not?

graph-theory planar-graphs

answered Oct 17, 2017 at 2:42

50 votes

Notation for an interval when you don't know which bound is greater

notation

answered Jun 8, 2018 at 15:37

44 votes

Accepted

Cubic formula gives the wrong result (triple checked)

algebra-precalculus polynomials roots cubics

answered May 17, 2017 at 14:39

42 votes

Accepted

Punch 2000 holes in 2000 polygons with 1000 needles

functions

answered Nov 12, 2018 at 22:33

39 votes

What does this converge to and why?

algebra-precalculus convergence-divergence roots quadratics continued-fractions

answered Mar 3, 2018 at 4:47

35 votes

Accepted

How to colour the US map with Yellow, Green, Red and Blue to minimize the number of states with the color of Green

graph-theory recreational-mathematics coloring

answered Apr 14, 2019 at 3:56

34 votes

Die fixed so it can't roll the same number twice in a row, using markov chains?

probability markov-chains

answered Apr 1, 2017 at 16:28

33 votes

Painting the plane, and finding points one unit apart

geometry graph-theory contest-math coordinate-systems

answered Oct 10, 2017 at 23:41

29 votes

Accepted

Rubik's cube function

functions rubiks-cube

answered Mar 1, 2018 at 16:03

28 votes

Accepted

Determine if this series converges or diverges

calculus sequences-and-series power-series

answered Mar 16, 2017 at 5:56

28 votes

Accepted

totient function series diverges?

sequences-and-series number-theory totient-function

answered Apr 20, 2017 at 22:15

27 votes

Accepted

Why is this proof for the four color theorem considered wrong?

graph-theory solution-verification coloring planar-graphs

answered Feb 11 at 13:20

26 votes

Accepted

How to tell whether two graphs are isomorphic?

graph-theory graph-isomorphism faq graph-invariants

answered Oct 24, 2017 at 3:06

25 votes

Is Bayes' Theorem really that interesting?

probability statistics bayes-theorem motivation

answered Jan 28, 2021 at 17:30

24 votes

Accepted

What is the smallest digraph whose reflexive, symmetric, transitive closures (in all combinations) are distinct?

combinatorics graph-theory relations

answered Oct 20, 2020 at 17:44

23 votes

Proving the set of the strictly increasing sequences of natural numbers is not enumerable.

real-analysis sequences-and-series proof-writing set-theory

answered Sep 21, 2017 at 21:08

22 votes

Examples of simple but highly unintuitive results?

soft-question recreational-mathematics intuition big-list

answered Jun 5, 2020 at 20:11

22 votes

Accepted

Probability of two people meeting in a given square grid.

combinatorics combinations random-walk

answered May 2, 2017 at 15:38

22 votes

Accepted

A magic trick - find out the fifth card if four is given

combinatorics discrete-mathematics graph-theory contest-math matching-theory

answered Oct 27, 2018 at 22:02

20 votes

Is there a way to generate individual uniformly distributed points on a sphere from a fixed amount of random real numbers per point?

geometry

answered Apr 12, 2019 at 0:31

20 votes

Does taking the dot product of two column vectors involve converting one of the vectors into row vectors first?

linear-algebra vector-spaces inner-products

answered May 12, 2020 at 0:22

19 votes

Accepted

Are there infinitely many Fermat prime pairs?

number-theory elementary-number-theory prime-numbers prime-factorization

answered Aug 4, 2021 at 21:37

19 votes

if two computers are playing tic-tac-toe, but they are choosing their squares randomly, what is the chance for X to win?

probability

answered Mar 2, 2021 at 15:44

18 votes

Accepted

Prove that $76$ raised to any integer power and then divided by $100$ (ignoring the remainder) is always divisible by $57$

elementary-number-theory modular-arithmetic divisibility

answered Feb 20, 2018 at 17:09

18 votes

Accepted

Arrange all numbers from 1 to n such that no 3 of them are in Arithmetic Progression

combinatorics arithmetic-progressions

answered Oct 24, 2019 at 21:48

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3,033 Answers

A multiplication algorithm found in a book by Paul Erdős: how does it work?

What's new in higher dimensions?

How can I justify this without determining the determinant?

Choosing office hours to maximise number of students who can attend at least one time slot

Fallacious proof involving trigonometry

Is this graph a planar graph or not?

Notation for an interval when you don't know which bound is greater

Cubic formula gives the wrong result (triple checked)

Punch 2000 holes in 2000 polygons with 1000 needles

What does this converge to and why?

How to colour the US map with Yellow, Green, Red and Blue to minimize the number of states with the color of Green

Die fixed so it can't roll the same number twice in a row, using markov chains?

Painting the plane, and finding points one unit apart

Rubik's cube function

Determine if this series converges or diverges

totient function series diverges?

Why is this proof for the four color theorem considered wrong?

How to tell whether two graphs are isomorphic?

Is Bayes' Theorem really that interesting?

What is the smallest digraph whose reflexive, symmetric, transitive closures (in all combinations) are distinct?

Proving the set of the strictly increasing sequences of natural numbers is not enumerable.

Examples of simple but highly unintuitive results?

Probability of two people meeting in a given square grid.

A magic trick - find out the fifth card if four is given

Is there a way to generate individual uniformly distributed points on a sphere from a fixed amount of random real numbers per point?

Does taking the dot product of two column vectors involve converting one of the vectors into row vectors first?

Are there infinitely many Fermat prime pairs?

if two computers are playing tic-tac-toe, but they are choosing their squares randomly, what is the chance for X to win?

Prove that $76$ raised to any integer power and then divided by $100$ (ignoring the remainder) is always divisible by $57$

Arrange all numbers from 1 to n such that no 3 of them are in Arithmetic Progression